{"api_version":"1","generated_at":"2026-06-03T11:06:51+00:00","cve":"CVE-2026-45841","urls":{"html":"https://cve.report/CVE-2026-45841","api":"https://cve.report/api/cve/CVE-2026-45841.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-45841","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45841"},"summary":{"title":"netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO\n\nnf_osf_match_one() computes ctx->window % f->wss.val in the\nOSF_WSS_MODULO branch with no guard for f->wss.val == 0. A\nCAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a\nsubsequent matching TCP SYN divides by zero and panics the kernel.\n\nReject the bogus fingerprint in nfnl_osf_add_callback() above the\nper-option for-loop. f->wss is per-fingerprint, not per-option, so\nthe check must run regardless of f->opt_num (including 0). Also\nreject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that\nas \"should not happen\".\n\nCrash:\n Oops: divide error: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98)\n Call Trace:\n <IRQ>\n  nf_osf_match (net/netfilter/nfnetlink_osf.c:220)\n  xt_osf_match_packet (net/netfilter/xt_osf.c:32)\n  ipt_do_table (net/ipv4/netfilter/ip_tables.c:348)\n  nf_hook_slow (net/netfilter/core.c:622)\n  ip_local_deliver (net/ipv4/ip_input.c:265)\n  ip_rcv (include/linux/skbuff.h:1162)\n  __netif_receive_skb_one_core (net/core/dev.c:6181)\n  process_backlog (net/core/dev.c:6642)\n  __napi_poll (net/core/dev.c:7710)\n  net_rx_action (net/core/dev.c:7945)\n  handle_softirqs (kernel/softirq.c:622)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 11:16:23","updated_at":"2026-06-01 17:17:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932","name":"https://git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f","name":"https://git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366","name":"https://git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082","name":"https://git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db","name":"https://git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d","name":"https://git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3","name":"https://git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625","name":"https://git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-45841","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45841","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 cb833bbc1b3c51e08652d3c86298307c07d3f2db git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 26900306a5a2c3e4f75c643a064525526bb6e5f3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 0694618cf3e9b120666e31f5f383a6e466d95a0d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 8def8fbd23f40e945febe913d04b731012ce0082 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 c55940895245d8ef658ab381248a28755218d625 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 9a05e195618a6d474f2bcd5b6376d0ffc2f00366 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384 2195574dc6d9017d32ac346987e12659f931d932 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.31","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.31 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.258 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.141 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"45841","cve":"CVE-2026-45841","epss":"0.000320000","percentile":"0.097530000","score_date":"2026-06-02","updated_at":"2026-06-03 00:08:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/netfilter/nfnetlink_osf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"cb833bbc1b3c51e08652d3c86298307c07d3f2db","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"26900306a5a2c3e4f75c643a064525526bb6e5f3","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"0694618cf3e9b120666e31f5f383a6e466d95a0d","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"8def8fbd23f40e945febe913d04b731012ce0082","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"c55940895245d8ef658ab381248a28755218d625","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"9a05e195618a6d474f2bcd5b6376d0ffc2f00366","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"},{"lessThan":"2195574dc6d9017d32ac346987e12659f931d932","status":"affected","version":"11eeef41d5f63c7d2f7fdfcc733eb7fb137cc384","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/netfilter/nfnetlink_osf.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.31"},{"lessThan":"2.6.31","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.141","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.141","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"2.6.31","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"2.6.31","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO\n\nnf_osf_match_one() computes ctx->window % f->wss.val in the\nOSF_WSS_MODULO branch with no guard for f->wss.val == 0. A\nCAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a\nsubsequent matching TCP SYN divides by zero and panics the kernel.\n\nReject the bogus fingerprint in nfnl_osf_add_callback() above the\nper-option for-loop. f->wss is per-fingerprint, not per-option, so\nthe check must run regardless of f->opt_num (including 0). Also\nreject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that\nas \"should not happen\".\n\nCrash:\n Oops: divide error: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98)\n Call Trace:\n <IRQ>\n  nf_osf_match (net/netfilter/nfnetlink_osf.c:220)\n  xt_osf_match_packet (net/netfilter/xt_osf.c:32)\n  ipt_do_table (net/ipv4/netfilter/ip_tables.c:348)\n  nf_hook_slow (net/netfilter/core.c:622)\n  ip_local_deliver (net/ipv4/ip_input.c:265)\n  ip_rcv (include/linux/skbuff.h:1162)\n  __netif_receive_skb_one_core (net/core/dev.c:6181)\n  process_backlog (net/core/dev.c:6642)\n  __napi_poll (net/core/dev.c:7710)\n  net_rx_action (net/core/dev.c:7945)\n  handle_softirqs (kernel/softirq.c:622)"}],"providerMetadata":{"dateUpdated":"2026-06-01T16:16:30.549Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/cb833bbc1b3c51e08652d3c86298307c07d3f2db"},{"url":"https://git.kernel.org/stable/c/26900306a5a2c3e4f75c643a064525526bb6e5f3"},{"url":"https://git.kernel.org/stable/c/0694618cf3e9b120666e31f5f383a6e466d95a0d"},{"url":"https://git.kernel.org/stable/c/8def8fbd23f40e945febe913d04b731012ce0082"},{"url":"https://git.kernel.org/stable/c/c55940895245d8ef658ab381248a28755218d625"},{"url":"https://git.kernel.org/stable/c/fb965b1cfe92b28d28b5ebe3116b81dbef9f2d2f"},{"url":"https://git.kernel.org/stable/c/9a05e195618a6d474f2bcd5b6376d0ffc2f00366"},{"url":"https://git.kernel.org/stable/c/2195574dc6d9017d32ac346987e12659f931d932"}],"title":"netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-45841","datePublished":"2026-05-27T09:24:40.805Z","dateReserved":"2026-05-13T15:03:33.078Z","dateUpdated":"2026-06-01T16:16:30.549Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 11:16:23","lastModifiedDate":"2026-06-01 17:17:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"45841","Ordinal":"1","Title":"netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO","CVE":"CVE-2026-45841","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"45841","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO\n\nnf_osf_match_one() computes ctx->window % f->wss.val in the\nOSF_WSS_MODULO branch with no guard for f->wss.val == 0. A\nCAP_NET_ADMIN user can add such a fingerprint via nfnetlink; a\nsubsequent matching TCP SYN divides by zero and panics the kernel.\n\nReject the bogus fingerprint in nfnl_osf_add_callback() above the\nper-option for-loop. f->wss is per-fingerprint, not per-option, so\nthe check must run regardless of f->opt_num (including 0). Also\nreject wss.wc >= OSF_WSS_MAX; nf_osf_match_one() already treats that\nas \"should not happen\".\n\nCrash:\n Oops: divide error: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:nf_osf_match_one (net/netfilter/nfnetlink_osf.c:98)\n Call Trace:\n <IRQ>\n  nf_osf_match (net/netfilter/nfnetlink_osf.c:220)\n  xt_osf_match_packet (net/netfilter/xt_osf.c:32)\n  ipt_do_table (net/ipv4/netfilter/ip_tables.c:348)\n  nf_hook_slow (net/netfilter/core.c:622)\n  ip_local_deliver (net/ipv4/ip_input.c:265)\n  ip_rcv (include/linux/skbuff.h:1162)\n  __netif_receive_skb_one_core (net/core/dev.c:6181)\n  process_backlog (net/core/dev.c:6642)\n  __napi_poll (net/core/dev.c:7710)\n  net_rx_action (net/core/dev.c:7945)\n  handle_softirqs (kernel/softirq.c:622)","Type":"Description","Title":"netfilter: nfnetlink_osf: fix divide-by-zero in OSF_WSS_MODULO"}]}}}