{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80636", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.777Z", "datePublished": "2026-08-28T06:48:50.241Z", "dateUpdated": "2026-08-28T06:48:50.241Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-28T06:48:50.241Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_conntrack_extend.h", "net/netfilter/nf_conntrack_core.c", "net/netfilter/nf_conntrack_extend.c"], "versions": [{"version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8", "lessThan": "6bba4846f196d081bf553391d12b5a73dcc48685", "status": "affected", "versionType": "git"}, {"version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8", "lessThan": "61eab1d0237eb513fe73e391a5926ee70092c325", "status": "affected", "versionType": "git"}, {"version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8", "lessThan": "d53eecbca16f056abba274075cb15120ab062518", "status": "affected", "versionType": "git"}, {"version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8", "lessThan": "a052a94bcc629acaecc2ce42a4af77f8fa399757", "status": "affected", "versionType": "git"}, {"version": "c56716c69ce1ac320432fb1ea5654196ba24d2f8", "lessThan": "35e21a4dccc5c255ba59ccfbfeb4629ed21da972", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/netfilter/nf_conntrack_extend.h", "net/netfilter/nf_conntrack_core.c", "net/netfilter/nf_conntrack_extend.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-80636", "lastModified": "2026-08-28T08:16:48.513", "metrics": {}, "published": "2026-08-28T08:16:48.513", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

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