{"api_version":"1","generated_at":"2026-09-15T21:30:50+00:00","cve":"CVE-2022-49775","urls":{"html":"https://cve.report/CVE-2022-49775","api":"https://cve.report/api/cve/CVE-2022-49775.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2022-49775","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-49775"},"summary":{"title":"tcp: cdg: allow tcp_cdg_release() to be called multiple times","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: cdg: allow tcp_cdg_release() to be called multiple times\n\nApparently, mptcp is able to call tcp_disconnect() on an already\ndisconnected flow. This is generally fine, unless current congestion\ncontrol is CDG, because it might trigger a double-free [1]\n\nInstead of fixing MPTCP, and future bugs, we can make tcp_disconnect()\nmore resilient.\n\n[1]\nBUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline]\nBUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567\n\nCPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: events mptcp_worker\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x719 mm/kasan/report.c:433\nkasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462\n____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145\n__mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327\nmptcp_do_fastclose net/mptcp/protocol.c:2592 [inline]\nmptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627\nprocess_one_work+0x991/0x1610 kernel/workqueue.c:2289\nworker_thread+0x665/0x1080 kernel/workqueue.c:2436\nkthread+0x2e4/0x3a0 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n</TASK>\n\nAllocated by task 3671:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track mm/kasan/common.c:45 [inline]\nset_alloc_info mm/kasan/common.c:437 [inline]\n____kasan_kmalloc mm/kasan/common.c:516 [inline]\n____kasan_kmalloc mm/kasan/common.c:475 [inline]\n__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525\nkmalloc_array include/linux/slab.h:640 [inline]\nkcalloc include/linux/slab.h:671 [inline]\ntcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg.c:380\ntcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:193\ntcp_reinit_congestion_control net/ipv4/tcp_cong.c:217 [inline]\ntcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:391\ndo_tcp_setsockopt+0x505/0x2320 net/ipv4/tcp.c:3513\ntcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3801\nmptcp_setsockopt+0x35f/0x2570 net/mptcp/sockopt.c:844\n__sys_setsockopt+0x2d6/0x690 net/socket.c:2252\n__do_sys_setsockopt net/socket.c:2263 [inline]\n__se_sys_setsockopt net/socket.c:2260 [inline]\n__x64_sys_setsockopt+0xba/0x150 net/socket.c:2260\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFreed by task 16:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track+0x21/0x30 mm/kasan/common.c:45\nkasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370\n____kasan_slab_free mm/kasan/common.c:367 [inline]\n____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:226\ntcp_v4_destroy_sock+0xdd/0x750 net/ipv4/tcp_ipv4.c:2254\ntcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969\ninet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1157\ntcp_done+0x23b/0x340 net/ipv4/tcp.c:4649\ntcp_rcv_state_process+0x40e7/0x4990 net/ipv4/tcp_input.c:6624\ntcp_v6_do_rcv+0x3fc/0x13c0 net/ipv6/tcp_ipv6.c:1525\ntcp_v6_rcv+0x2e8e/0x3830 net/ipv6/tcp_ipv6.c:1759\nip6_protocol_deliver_rcu+0x2db/0x1950 net/ipv6/ip6_input.c:439\nip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:484\nNF_HOOK include/linux/netfilter.h:302 [inline]\nNF_HOOK include/linux/netfilter.h:296 [inline]\nip6_input+0x9c/0xd\n---truncated---","state":"PUBLISHED","assigner":"Linux","published_at":"2025-05-01 15:16:00","updated_at":"2026-08-04 10:17:56"},"problem_types":["CWE-415"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/0b19171439016a8e4c97eafe543670ac86e2b8fe","name":"https://git.kernel.org/stable/c/0b19171439016a8e4c97eafe543670ac86e2b8fe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1b639be27cbf428a5ca01dcf8b5d654194c956f8","name":"https://git.kernel.org/stable/c/1b639be27cbf428a5ca01dcf8b5d654194c956f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78be2ee0112409ae4e9ee9e326151e0559b3d239","name":"https://git.kernel.org/stable/c/78be2ee0112409ae4e9ee9e326151e0559b3d239","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4026033907cc6186d86b48daa4a252c860db2536","name":"https://git.kernel.org/stable/c/4026033907cc6186d86b48daa4a252c860db2536","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b49026d9c86f35a4c5bfb8d7345c9c4379828c6b","name":"https://git.kernel.org/stable/c/b49026d9c86f35a4c5bfb8d7345c9c4379828c6b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72e560cb8c6f80fc2b4afc5d3634a32465e13a51","name":"https://git.kernel.org/stable/c/72e560cb8c6f80fc2b4afc5d3634a32465e13a51","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9e481d87349d2282f400ee1d010a169c99f766b8","name":"https://git.kernel.org/stable/c/9e481d87349d2282f400ee1d010a169c99f766b8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35309be06b6feded2ab2cafbc2bca8534c2fa41e","name":"https://git.kernel.org/stable/c/35309be06b6feded2ab2cafbc2bca8534c2fa41e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-49775","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49775","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 0b19171439016a8e4c97eafe543670ac86e2b8fe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 4026033907cc6186d86b48daa4a252c860db2536 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 9e481d87349d2282f400ee1d010a169c99f766b8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 78be2ee0112409ae4e9ee9e326151e0559b3d239 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 35309be06b6feded2ab2cafbc2bca8534c2fa41e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e b49026d9c86f35a4c5bfb8d7345c9c4379828c6b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 1b639be27cbf428a5ca01dcf8b5d654194c956f8 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e 72e560cb8c6f80fc2b4afc5d3634a32465e13a51 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.2","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.9.334 4.9.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.14.300 4.14.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19.267 4.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4.225 5.4.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.156 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.80 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0.10 6.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2022","cve_id":"49775","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/ipv4/tcp_cdg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"0b19171439016a8e4c97eafe543670ac86e2b8fe","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"4026033907cc6186d86b48daa4a252c860db2536","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"9e481d87349d2282f400ee1d010a169c99f766b8","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"78be2ee0112409ae4e9ee9e326151e0559b3d239","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"35309be06b6feded2ab2cafbc2bca8534c2fa41e","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"b49026d9c86f35a4c5bfb8d7345c9c4379828c6b","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"1b639be27cbf428a5ca01dcf8b5d654194c956f8","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"},{"lessThan":"72e560cb8c6f80fc2b4afc5d3634a32465e13a51","status":"affected","version":"2b0a8c9eee81882fc0001ccf6d9af62cdc682f9e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/ipv4/tcp_cdg.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.2"},{"lessThan":"4.2","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"4.9.*","status":"unaffected","version":"4.9.334","versionType":"semver"},{"lessThanOrEqual":"4.14.*","status":"unaffected","version":"4.14.300","versionType":"semver"},{"lessThanOrEqual":"4.19.*","status":"unaffected","version":"4.19.267","versionType":"semver"},{"lessThanOrEqual":"5.4.*","status":"unaffected","version":"5.4.225","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.156","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.80","versionType":"semver"},{"lessThanOrEqual":"6.0.*","status":"unaffected","version":"6.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"6.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.9.334","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.14.300","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"4.19.267","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.4.225","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.156","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.80","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.0.10","versionStartIncluding":"4.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1","versionStartIncluding":"4.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: cdg: allow tcp_cdg_release() to be called multiple times\n\nApparently, mptcp is able to call tcp_disconnect() on an already\ndisconnected flow. This is generally fine, unless current congestion\ncontrol is CDG, because it might trigger a double-free [1]\n\nInstead of fixing MPTCP, and future bugs, we can make tcp_disconnect()\nmore resilient.\n\n[1]\nBUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline]\nBUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567\n\nCPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: events mptcp_worker\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x719 mm/kasan/report.c:433\nkasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462\n____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145\n__mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327\nmptcp_do_fastclose net/mptcp/protocol.c:2592 [inline]\nmptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627\nprocess_one_work+0x991/0x1610 kernel/workqueue.c:2289\nworker_thread+0x665/0x1080 kernel/workqueue.c:2436\nkthread+0x2e4/0x3a0 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n</TASK>\n\nAllocated by task 3671:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track mm/kasan/common.c:45 [inline]\nset_alloc_info mm/kasan/common.c:437 [inline]\n____kasan_kmalloc mm/kasan/common.c:516 [inline]\n____kasan_kmalloc mm/kasan/common.c:475 [inline]\n__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525\nkmalloc_array include/linux/slab.h:640 [inline]\nkcalloc include/linux/slab.h:671 [inline]\ntcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg.c:380\ntcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:193\ntcp_reinit_congestion_control net/ipv4/tcp_cong.c:217 [inline]\ntcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:391\ndo_tcp_setsockopt+0x505/0x2320 net/ipv4/tcp.c:3513\ntcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3801\nmptcp_setsockopt+0x35f/0x2570 net/mptcp/sockopt.c:844\n__sys_setsockopt+0x2d6/0x690 net/socket.c:2252\n__do_sys_setsockopt net/socket.c:2263 [inline]\n__se_sys_setsockopt net/socket.c:2260 [inline]\n__x64_sys_setsockopt+0xba/0x150 net/socket.c:2260\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFreed by task 16:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track+0x21/0x30 mm/kasan/common.c:45\nkasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370\n____kasan_slab_free mm/kasan/common.c:367 [inline]\n____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:226\ntcp_v4_destroy_sock+0xdd/0x750 net/ipv4/tcp_ipv4.c:2254\ntcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969\ninet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1157\ntcp_done+0x23b/0x340 net/ipv4/tcp.c:4649\ntcp_rcv_state_process+0x40e7/0x4990 net/ipv4/tcp_input.c:6624\ntcp_v6_do_rcv+0x3fc/0x13c0 net/ipv6/tcp_ipv6.c:1525\ntcp_v6_rcv+0x2e8e/0x3830 net/ipv6/tcp_ipv6.c:1759\nip6_protocol_deliver_rcu+0x2db/0x1950 net/ipv6/ip6_input.c:439\nip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:484\nNF_HOOK include/linux/netfilter.h:302 [inline]\nNF_HOOK include/linux/netfilter.h:296 [inline]\nip6_input+0x9c/0xd\n---truncated---"}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-08-04T09:06:32.048Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0b19171439016a8e4c97eafe543670ac86e2b8fe"},{"url":"https://git.kernel.org/stable/c/4026033907cc6186d86b48daa4a252c860db2536"},{"url":"https://git.kernel.org/stable/c/9e481d87349d2282f400ee1d010a169c99f766b8"},{"url":"https://git.kernel.org/stable/c/78be2ee0112409ae4e9ee9e326151e0559b3d239"},{"url":"https://git.kernel.org/stable/c/35309be06b6feded2ab2cafbc2bca8534c2fa41e"},{"url":"https://git.kernel.org/stable/c/b49026d9c86f35a4c5bfb8d7345c9c4379828c6b"},{"url":"https://git.kernel.org/stable/c/1b639be27cbf428a5ca01dcf8b5d654194c956f8"},{"url":"https://git.kernel.org/stable/c/72e560cb8c6f80fc2b4afc5d3634a32465e13a51"}],"title":"tcp: cdg: allow tcp_cdg_release() to be called multiple times","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2022-49775","datePublished":"2025-05-01T14:09:11.827Z","dateReserved":"2025-04-16T07:17:33.805Z","dateUpdated":"2026-08-04T09:06:32.048Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-05-01 15:16:00","lastModifiedDate":"2026-08-04 10:17:56","problem_types":["CWE-415"],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9},{"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:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"4.9.334","matchCriteriaId":"31ABA434-A99A-465F-8A16-BE7DE4551E8D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"4.14.300","matchCriteriaId":"424802D2-E9E7-48A9-AD6F-DF2227B3D83A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"4.19.267","matchCriteriaId":"A5C69A12-68E2-400E-9A5A-375A673C8402"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.4.225","matchCriteriaId":"94D21814-3051-4860-AB06-C7880A3D4933"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.156","matchCriteriaId":"E2152F3D-E6D3-405D-B0BE-911B8B6E2EE6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.80","matchCriteriaId":"51BBEF3B-79F5-4D4C-ADBA-F34DA0E2465C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.0.10","matchCriteriaId":"64F9ADD1-3ADB-4D66-A00F-4A83010B05F0"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2022","CveId":"49775","Ordinal":"1","Title":"tcp: cdg: allow tcp_cdg_release() to be called multiple times","CVE":"CVE-2022-49775","Year":"2022"},"notes":[{"CveYear":"2022","CveId":"49775","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: cdg: allow tcp_cdg_release() to be called multiple times\n\nApparently, mptcp is able to call tcp_disconnect() on an already\ndisconnected flow. This is generally fine, unless current congestion\ncontrol is CDG, because it might trigger a double-free [1]\n\nInstead of fixing MPTCP, and future bugs, we can make tcp_disconnect()\nmore resilient.\n\n[1]\nBUG: KASAN: double-free in slab_free mm/slub.c:3539 [inline]\nBUG: KASAN: double-free in kfree+0xe2/0x580 mm/slub.c:4567\n\nCPU: 0 PID: 3645 Comm: kworker/0:7 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: events mptcp_worker\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x719 mm/kasan/report.c:433\nkasan_report_invalid_free+0x81/0x190 mm/kasan/report.c:462\n____kasan_slab_free+0x18b/0x1c0 mm/kasan/common.c:356\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_disconnect+0x980/0x1e20 net/ipv4/tcp.c:3145\n__mptcp_close_ssk+0x5ca/0x7e0 net/mptcp/protocol.c:2327\nmptcp_do_fastclose net/mptcp/protocol.c:2592 [inline]\nmptcp_worker+0x78c/0xff0 net/mptcp/protocol.c:2627\nprocess_one_work+0x991/0x1610 kernel/workqueue.c:2289\nworker_thread+0x665/0x1080 kernel/workqueue.c:2436\nkthread+0x2e4/0x3a0 kernel/kthread.c:376\nret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n</TASK>\n\nAllocated by task 3671:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track mm/kasan/common.c:45 [inline]\nset_alloc_info mm/kasan/common.c:437 [inline]\n____kasan_kmalloc mm/kasan/common.c:516 [inline]\n____kasan_kmalloc mm/kasan/common.c:475 [inline]\n__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525\nkmalloc_array include/linux/slab.h:640 [inline]\nkcalloc include/linux/slab.h:671 [inline]\ntcp_cdg_init+0x10d/0x170 net/ipv4/tcp_cdg.c:380\ntcp_init_congestion_control+0xab/0x550 net/ipv4/tcp_cong.c:193\ntcp_reinit_congestion_control net/ipv4/tcp_cong.c:217 [inline]\ntcp_set_congestion_control+0x96c/0xaa0 net/ipv4/tcp_cong.c:391\ndo_tcp_setsockopt+0x505/0x2320 net/ipv4/tcp.c:3513\ntcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3801\nmptcp_setsockopt+0x35f/0x2570 net/mptcp/sockopt.c:844\n__sys_setsockopt+0x2d6/0x690 net/socket.c:2252\n__do_sys_setsockopt net/socket.c:2263 [inline]\n__se_sys_setsockopt net/socket.c:2260 [inline]\n__x64_sys_setsockopt+0xba/0x150 net/socket.c:2260\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFreed by task 16:\nkasan_save_stack+0x1e/0x40 mm/kasan/common.c:38\nkasan_set_track+0x21/0x30 mm/kasan/common.c:45\nkasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370\n____kasan_slab_free mm/kasan/common.c:367 [inline]\n____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329\nkasan_slab_free include/linux/kasan.h:200 [inline]\nslab_free_hook mm/slub.c:1759 [inline]\nslab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785\nslab_free mm/slub.c:3539 [inline]\nkfree+0xe2/0x580 mm/slub.c:4567\ntcp_cleanup_congestion_control+0x70/0x120 net/ipv4/tcp_cong.c:226\ntcp_v4_destroy_sock+0xdd/0x750 net/ipv4/tcp_ipv4.c:2254\ntcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969\ninet_csk_destroy_sock+0x196/0x440 net/ipv4/inet_connection_sock.c:1157\ntcp_done+0x23b/0x340 net/ipv4/tcp.c:4649\ntcp_rcv_state_process+0x40e7/0x4990 net/ipv4/tcp_input.c:6624\ntcp_v6_do_rcv+0x3fc/0x13c0 net/ipv6/tcp_ipv6.c:1525\ntcp_v6_rcv+0x2e8e/0x3830 net/ipv6/tcp_ipv6.c:1759\nip6_protocol_deliver_rcu+0x2db/0x1950 net/ipv6/ip6_input.c:439\nip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:484\nNF_HOOK include/linux/netfilter.h:302 [inline]\nNF_HOOK include/linux/netfilter.h:296 [inline]\nip6_input+0x9c/0xd\n---truncated---","Type":"Description","Title":"tcp: cdg: allow tcp_cdg_release() to be called multiple times"}]}}}