{"api_version":"1","generated_at":"2026-09-01T05:07:11+00:00","cve":"CVE-2026-80636","urls":{"html":"https://cve.report/CVE-2026-80636","api":"https://cve.report/api/cve/CVE-2026-80636.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80636","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80636"},"summary":{"title":"netfilter: conntrack: revert ct extension genid infrastructure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: revert ct extension genid infrastructure\n\nThis infrastructure is not used anymore after moving ct timeout and\nhelper to use datapath refcount to track object use.\n\nRevert commit c56716c69ce1 (\"netfilter: extensions: introduce extension\ngenid count\") this patch disables all ct extensions (leading to NULL)\nfor unconfirmed conntracks, when this is only targeted at ct helper and\nct timeout. There is also codebase that dereferences the ct extension\nwithout checking for NULL which could lead to crash.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:48","updated_at":"2026-08-28 08:16:48"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685","name":"https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325","name":"https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757","name":"https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518","name":"https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972","name":"https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80636","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80636","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 6bba4846f196d081bf553391d12b5a73dcc48685 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 61eab1d0237eb513fe73e391a5926ee70092c325 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 d53eecbca16f056abba274075cb15120ab062518 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 a052a94bcc629acaecc2ce42a4af77f8fa399757 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 35e21a4dccc5c255ba59ccfbfeb4629ed21da972 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80636","cve":"CVE-2026-80636","epss":"0.001680000","percentile":"0.062770000","score_date":"2026-08-30","updated_at":"2026-08-31 00:14:06"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["include/net/netfilter/nf_conntrack_extend.h","net/netfilter/nf_conntrack_core.c","net/netfilter/nf_conntrack_extend.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"6bba4846f196d081bf553391d12b5a73dcc48685","status":"affected","version":"c56716c69ce1ac320432fb1ea5654196ba24d2f8","versionType":"git"},{"lessThan":"61eab1d0237eb513fe73e391a5926ee70092c325","status":"affected","version":"c56716c69ce1ac320432fb1ea5654196ba24d2f8","versionType":"git"},{"lessThan":"d53eecbca16f056abba274075cb15120ab062518","status":"affected","version":"c56716c69ce1ac320432fb1ea5654196ba24d2f8","versionType":"git"},{"lessThan":"a052a94bcc629acaecc2ce42a4af77f8fa399757","status":"affected","version":"c56716c69ce1ac320432fb1ea5654196ba24d2f8","versionType":"git"},{"lessThan":"35e21a4dccc5c255ba59ccfbfeb4629ed21da972","status":"affected","version":"c56716c69ce1ac320432fb1ea5654196ba24d2f8","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["include/net/netfilter/nf_conntrack_extend.h","net/netfilter/nf_conntrack_core.c","net/netfilter/nf_conntrack_extend.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: revert ct extension genid infrastructure\n\nThis infrastructure is not used anymore after moving ct timeout and\nhelper to use datapath refcount to track object use.\n\nRevert commit c56716c69ce1 (\"netfilter: extensions: introduce extension\ngenid count\") this patch disables all ct extensions (leading to NULL)\nfor unconfirmed conntracks, when this is only targeted at ct helper and\nct timeout. There is also codebase that dereferences the ct extension\nwithout checking for NULL which could lead to crash."}],"providerMetadata":{"dateUpdated":"2026-08-28T06:48:50.241Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685"},{"url":"https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325"},{"url":"https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518"},{"url":"https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757"},{"url":"https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972"}],"title":"netfilter: conntrack: revert ct extension genid infrastructure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80636","datePublished":"2026-08-28T06:48:50.241Z","dateReserved":"2026-08-26T14:34:25.777Z","dateUpdated":"2026-08-28T06:48:50.241Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:48","lastModifiedDate":"2026-08-28 08:16:48","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80636","Ordinal":"1","Title":"netfilter: conntrack: revert ct extension genid infrastructure","CVE":"CVE-2026-80636","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80636","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: conntrack: revert ct extension genid infrastructure\n\nThis infrastructure is not used anymore after moving ct timeout and\nhelper to use datapath refcount to track object use.\n\nRevert commit c56716c69ce1 (\"netfilter: extensions: introduce extension\ngenid count\") this patch disables all ct extensions (leading to NULL)\nfor unconfirmed conntracks, when this is only targeted at ct helper and\nct timeout. There is also codebase that dereferences the ct extension\nwithout checking for NULL which could lead to crash.","Type":"Description","Title":"netfilter: conntrack: revert ct extension genid infrastructure"}]}}}