{"api_version":"1","generated_at":"2026-07-23T14:00:44+00:00","cve":"CVE-2025-21959","urls":{"html":"https://cve.report/CVE-2025-21959","api":"https://cve.report/api/cve/CVE-2025-21959.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2025-21959","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-21959"},"summary":{"title":"netfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()\n\nSince commit b36e4523d4d5 (\"netfilter: nf_conncount: fix garbage\ncollection confirm race\"), `cpu` and `jiffies32` were introduced to\nthe struct nf_conncount_tuple.\n\nThe commit made nf_conncount_add() initialize `conn->cpu` and\n`conn->jiffies32` when allocating the struct.\nIn contrast, count_tree() was not changed to initialize them.\n\nBy commit 34848d5c896e (\"netfilter: nf_conncount: Split insert and\ntraversal\"), count_tree() was split and the relevant allocation\ncode now resides in insert_tree().\nInitialize `conn->cpu` and `conn->jiffies32` in insert_tree().\n\nBUG: KMSAN: uninit-value in find_or_evict net/netfilter/nf_conncount.c:117 [inline]\nBUG: KMSAN: uninit-value in __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n find_or_evict net/netfilter/nf_conncount.c:117 [inline]\n __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n count_tree net/netfilter/nf_conncount.c:438 [inline]\n nf_conncount_count+0x82f/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ipv4/ip_input.c:669\n __netif_receive_skb_list_ptype net/core/dev.c:5936 [inline]\n __netif_receive_skb_list_core+0x15c5/0x1670 net/core/dev.c:5983\n __netif_receive_skb_list net/core/dev.c:6035 [inline]\n netif_receive_skb_list_internal+0x1085/0x1700 net/core/dev.c:6126\n netif_receive_skb_list+0x5a/0x460 net/core/dev.c:6178\n xdp_recv_frames net/bpf/test_run.c:280 [inline]\n xdp_test_run_batch net/bpf/test_run.c:361 [inline]\n bpf_test_run_xdp_live+0x2e86/0x3480 net/bpf/test_run.c:390\n bpf_prog_test_run_xdp+0xf1d/0x1ae0 net/bpf/test_run.c:1316\n bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813\n __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]\n __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900\n ia32_sys_call+0x394d/0x4180 arch/x86/include/generated/asm/syscalls_32.h:358\n do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]\n __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:387\n do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:412\n do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:450\n entry_SYSENTER_compat_after_hwframe+0x84/0x8e\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4121 [inline]\n slab_alloc_node mm/slub.c:4164 [inline]\n kmem_cache_alloc_noprof+0x915/0xe10 mm/slub.c:4171\n insert_tree net/netfilter/nf_conncount.c:372 [inline]\n count_tree net/netfilter/nf_conncount.c:450 [inline]\n nf_conncount_count+0x1415/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ip\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2025-04-01 16:15:27","updated_at":"2026-07-14 13:17:27"},"problem_types":["CWE-908","CWE-908 CWE-908 Use of Uninitialized Resource"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"ADP","type":"DECLARED","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"5.5","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}}],"references":[{"url":"https://git.kernel.org/stable/c/db1e0c0856821c59a32ea3af79476bf20a6beeb2","name":"https://git.kernel.org/stable/c/db1e0c0856821c59a32ea3af79476bf20a6beeb2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html","name":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2a154ce766b995494e88d8d117fa82cc6b73dd87","name":"https://git.kernel.org/stable/c/2a154ce766b995494e88d8d117fa82cc6b73dd87","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f522229c5563b59b4240261e406779bba6754159","name":"https://git.kernel.org/stable/c/f522229c5563b59b4240261e406779bba6754159","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e8544a5a97bee3674e7cd6bf0f3a4af517fa9146","name":"https://git.kernel.org/stable/c/e8544a5a97bee3674e7cd6bf0f3a4af517fa9146","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","name":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","refsource":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d653bfeb07ebb3499c403404c21ac58a16531607","name":"https://git.kernel.org/stable/c/d653bfeb07ebb3499c403404c21ac58a16531607","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a62a25c6ad58fae997f48a0749afeda1c252ae51","name":"https://git.kernel.org/stable/c/a62a25c6ad58fae997f48a0749afeda1c252ae51","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html","name":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fda50302a13701d47fbe01e1739c7a51114144fb","name":"https://git.kernel.org/stable/c/fda50302a13701d47fbe01e1739c7a51114144fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2db5baaf047a7c8d6ed5e2cc657b7854e155b7fc","name":"https://git.kernel.org/stable/c/2db5baaf047a7c8d6ed5e2cc657b7854e155b7fc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-21959","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21959","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452 f522229c5563b59b4240261e406779bba6754159 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452 2a154ce766b995494e88d8d117fa82cc6b73dd87 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452 e8544a5a97bee3674e7cd6bf0f3a4af517fa9146 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452 a62a25c6ad58fae997f48a0749afeda1c252ae51 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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4.18","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.18 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.292 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.236 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.180 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.132 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.84 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.20 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.13.8 6.13.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 * 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Coordinator","timestamp":"2025-10-01T17:15:56.023953Z","version":"2.0.3"},"type":"ssvc"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-908","description":"CWE-908 Use of Uninitialized Resource","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2025-10-01T17:15:58.938Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"},{"providerMetadata":{"dateUpdated":"2025-11-03T19:40:01.234Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"},{"url":"https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"}],"title":"CVE Program Container"},{"affected":[{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]},{"defaultStatus":"unknown","product":"SIMATIC S7-1500 CPU 1518-4 PN/DP 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MFP","vendor":"Siemens","versions":[{"lessThan":"*","status":"affected","version":"V3.1.6","versionType":"custom"}]}],"providerMetadata":{"dateUpdated":"2026-07-14T12:40:35.517Z","orgId":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e","shortName":"siemens-SADP"},"references":[{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}],"x_adpType":"supplier"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nf_conncount.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f522229c5563b59b4240261e406779bba6754159","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"2a154ce766b995494e88d8d117fa82cc6b73dd87","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"e8544a5a97bee3674e7cd6bf0f3a4af517fa9146","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"a62a25c6ad58fae997f48a0749afeda1c252ae51","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"fda50302a13701d47fbe01e1739c7a51114144fb","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"db1e0c0856821c59a32ea3af79476bf20a6beeb2","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"2db5baaf047a7c8d6ed5e2cc657b7854e155b7fc","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"lessThan":"d653bfeb07ebb3499c403404c21ac58a16531607","status":"affected","version":"b36e4523d4d56e2595e28f16f6ccf1cd6a9fc452","versionType":"git"},{"status":"affected","version":"75af3d78168e654a5cd8bbc4c774f97be836165f","versionType":"git"},{"lessThan":"4.15","status":"affected","version":"4.14.92","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nf_conncount.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.18"},{"lessThan":"4.18","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.292","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.236","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.180","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.132","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.84","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.20","versionType":"semver"},{"lessThanOrEqual":"6.13.*","status":"unaffected","version":"6.13.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.14","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.292","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.236","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.180","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.132","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.84","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.20","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.13.8","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.14","versionStartIncluding":"4.18","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.92","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()\n\nSince commit b36e4523d4d5 (\"netfilter: nf_conncount: fix garbage\ncollection confirm race\"), `cpu` and `jiffies32` were introduced to\nthe struct nf_conncount_tuple.\n\nThe commit made nf_conncount_add() initialize `conn->cpu` and\n`conn->jiffies32` when allocating the struct.\nIn contrast, count_tree() was not changed to initialize them.\n\nBy commit 34848d5c896e (\"netfilter: nf_conncount: Split insert and\ntraversal\"), count_tree() was split and the relevant allocation\ncode now resides in insert_tree().\nInitialize `conn->cpu` and `conn->jiffies32` in insert_tree().\n\nBUG: KMSAN: uninit-value in find_or_evict net/netfilter/nf_conncount.c:117 [inline]\nBUG: KMSAN: uninit-value in __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n find_or_evict net/netfilter/nf_conncount.c:117 [inline]\n __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n count_tree net/netfilter/nf_conncount.c:438 [inline]\n nf_conncount_count+0x82f/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ipv4/ip_input.c:669\n __netif_receive_skb_list_ptype net/core/dev.c:5936 [inline]\n __netif_receive_skb_list_core+0x15c5/0x1670 net/core/dev.c:5983\n __netif_receive_skb_list net/core/dev.c:6035 [inline]\n netif_receive_skb_list_internal+0x1085/0x1700 net/core/dev.c:6126\n netif_receive_skb_list+0x5a/0x460 net/core/dev.c:6178\n xdp_recv_frames net/bpf/test_run.c:280 [inline]\n xdp_test_run_batch net/bpf/test_run.c:361 [inline]\n bpf_test_run_xdp_live+0x2e86/0x3480 net/bpf/test_run.c:390\n bpf_prog_test_run_xdp+0xf1d/0x1ae0 net/bpf/test_run.c:1316\n bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813\n __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]\n __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900\n ia32_sys_call+0x394d/0x4180 arch/x86/include/generated/asm/syscalls_32.h:358\n do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]\n __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:387\n do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:412\n do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:450\n entry_SYSENTER_compat_after_hwframe+0x84/0x8e\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4121 [inline]\n slab_alloc_node mm/slub.c:4164 [inline]\n kmem_cache_alloc_noprof+0x915/0xe10 mm/slub.c:4171\n insert_tree net/netfilter/nf_conncount.c:372 [inline]\n count_tree net/netfilter/nf_conncount.c:450 [inline]\n nf_conncount_count+0x1415/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ip\n---truncated---"}],"providerMetadata":{"dateUpdated":"2026-05-23T15:57:29.875Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f522229c5563b59b4240261e406779bba6754159"},{"url":"https://git.kernel.org/stable/c/2a154ce766b995494e88d8d117fa82cc6b73dd87"},{"url":"https://git.kernel.org/stable/c/e8544a5a97bee3674e7cd6bf0f3a4af517fa9146"},{"url":"https://git.kernel.org/stable/c/a62a25c6ad58fae997f48a0749afeda1c252ae51"},{"url":"https://git.kernel.org/stable/c/fda50302a13701d47fbe01e1739c7a51114144fb"},{"url":"https://git.kernel.org/stable/c/db1e0c0856821c59a32ea3af79476bf20a6beeb2"},{"url":"https://git.kernel.org/stable/c/2db5baaf047a7c8d6ed5e2cc657b7854e155b7fc"},{"url":"https://git.kernel.org/stable/c/d653bfeb07ebb3499c403404c21ac58a16531607"}],"title":"netfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2025-21959","datePublished":"2025-04-01T15:46:57.775Z","dateReserved":"2024-12-29T08:45:45.793Z","dateUpdated":"2026-07-14T12:40:35.517Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-04-01 16:15:27","lastModifiedDate":"2026-07-14 13:17:27","problem_types":["CWE-908","CWE-908 CWE-908 Use of Uninitialized Resource"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6},{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","baseScore":5.5,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2025-10-01T17:15:56.023953Z","id":"CVE-2025-21959","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.92","versionEndExcluding":"4.15","matchCriteriaId":"38A1AC7C-17D5-4E10-97A0-ED3637CD9D40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18","versionEndExcluding":"5.4.292","matchCriteriaId":"1A0A6CD9-3ED4-4FB3-80EE-9BF216598C6C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.236","matchCriteriaId":"1DF46FB0-9163-4ABE-8CCA-32A497D4715B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.180","matchCriteriaId":"D19801C8-3D18-405D-9989-E6C9B30255FA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.132","matchCriteriaId":"91D1C2F6-55A1-4CF4-AC66-ADF758259C59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.84","matchCriteriaId":"994E0F00-FAC4-40E4-9068-C7D4D8242EC8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.20","matchCriteriaId":"60E9C5DF-D778-4572-848A-5D6CFFE022CA"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.13.8","matchCriteriaId":"0A20D4D7-B329-4C68-B662-76062EA7DCF0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:*","matchCriteriaId":"186716B6-2B66-4BD0-852E-D48E71C0C85F"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:*","matchCriteriaId":"0D3E781C-403A-498F-9DA9-ECEE50F41E75"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc3:*:*:*:*:*:*","matchCriteriaId":"66619FB8-0AAF-4166-B2CF-67B24143261D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc4:*:*:*:*:*:*","matchCriteriaId":"D3D6550E-6679-4560-902D-AF52DCFE905B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc5:*:*:*:*:*:*","matchCriteriaId":"45B90F6B-BEC7-4D4E-883A-9DBADE021750"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.14:rc6:*:*:*:*:*:*","matchCriteriaId":"1759FFB7-531C-41B1-9AE1-FD3D80E0D920"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2025","CveId":"21959","Ordinal":"1","Title":"netfilter: nf_conncount: Fully initialize struct nf_conncount_tu","CVE":"CVE-2025-21959","Year":"2025"},"notes":[{"CveYear":"2025","CveId":"21959","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conncount: Fully initialize struct nf_conncount_tuple in insert_tree()\n\nSince commit b36e4523d4d5 (\"netfilter: nf_conncount: fix garbage\ncollection confirm race\"), `cpu` and `jiffies32` were introduced to\nthe struct nf_conncount_tuple.\n\nThe commit made nf_conncount_add() initialize `conn->cpu` and\n`conn->jiffies32` when allocating the struct.\nIn contrast, count_tree() was not changed to initialize them.\n\nBy commit 34848d5c896e (\"netfilter: nf_conncount: Split insert and\ntraversal\"), count_tree() was split and the relevant allocation\ncode now resides in insert_tree().\nInitialize `conn->cpu` and `conn->jiffies32` in insert_tree().\n\nBUG: KMSAN: uninit-value in find_or_evict net/netfilter/nf_conncount.c:117 [inline]\nBUG: KMSAN: uninit-value in __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n find_or_evict net/netfilter/nf_conncount.c:117 [inline]\n __nf_conncount_add+0xd9c/0x2850 net/netfilter/nf_conncount.c:143\n count_tree net/netfilter/nf_conncount.c:438 [inline]\n nf_conncount_count+0x82f/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ipv4/ip_input.c:669\n __netif_receive_skb_list_ptype net/core/dev.c:5936 [inline]\n __netif_receive_skb_list_core+0x15c5/0x1670 net/core/dev.c:5983\n __netif_receive_skb_list net/core/dev.c:6035 [inline]\n netif_receive_skb_list_internal+0x1085/0x1700 net/core/dev.c:6126\n netif_receive_skb_list+0x5a/0x460 net/core/dev.c:6178\n xdp_recv_frames net/bpf/test_run.c:280 [inline]\n xdp_test_run_batch net/bpf/test_run.c:361 [inline]\n bpf_test_run_xdp_live+0x2e86/0x3480 net/bpf/test_run.c:390\n bpf_prog_test_run_xdp+0xf1d/0x1ae0 net/bpf/test_run.c:1316\n bpf_prog_test_run+0x5e5/0xa30 kernel/bpf/syscall.c:4407\n __sys_bpf+0x6aa/0xd90 kernel/bpf/syscall.c:5813\n __do_sys_bpf kernel/bpf/syscall.c:5902 [inline]\n __se_sys_bpf kernel/bpf/syscall.c:5900 [inline]\n __ia32_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5900\n ia32_sys_call+0x394d/0x4180 arch/x86/include/generated/asm/syscalls_32.h:358\n do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]\n __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:387\n do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:412\n do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:450\n entry_SYSENTER_compat_after_hwframe+0x84/0x8e\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:4121 [inline]\n slab_alloc_node mm/slub.c:4164 [inline]\n kmem_cache_alloc_noprof+0x915/0xe10 mm/slub.c:4171\n insert_tree net/netfilter/nf_conncount.c:372 [inline]\n count_tree net/netfilter/nf_conncount.c:450 [inline]\n nf_conncount_count+0x1415/0x1e80 net/netfilter/nf_conncount.c:521\n connlimit_mt+0x7f6/0xbd0 net/netfilter/xt_connlimit.c:72\n __nft_match_eval net/netfilter/nft_compat.c:403 [inline]\n nft_match_eval+0x1a5/0x300 net/netfilter/nft_compat.c:433\n expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]\n nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288\n nft_do_chain_ipv4+0x1a5/0x230 net/netfilter/nft_chain_filter.c:23\n nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]\n nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626\n nf_hook_slow_list+0x24d/0x860 net/netfilter/core.c:663\n NF_HOOK_LIST include/linux/netfilter.h:350 [inline]\n ip_sublist_rcv+0x17b7/0x17f0 net/ipv4/ip_input.c:633\n ip_list_rcv+0x9ef/0xa40 net/ip\n---truncated---","Type":"Description","Title":"netfilter: nf_conncount: Fully initialize struct nf_conncount_tu"}]}}}