CVE-2026-80636

{"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"}}}}

{}

{"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"}

{"bugzilla": {"description": "kernel: netfilter: conntrack: revert ct extension genid infrastructure", "id": "2525500", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525500"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: conntrack: revert ct extension genid infrastructure\nThis infrastructure is not used anymore after moving ct timeout and\nhelper to use datapath refcount to track object use.\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.", "A flaw was found in the Netfilter conntrack component of the Linux kernel. This vulnerability arises from the improper handling of connection tracking (conntrack) extensions. Specifically, a codebase change that disables all conntrack extensions for unconfirmed conntracks, without proper null checks, can lead to a system crash. This could allow a local attacker to cause a Denial of Service (DoS)."], "name": "CVE-2026-80636", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80636\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80636\nhttps://lore.kernel.org/linux-cve-announce/2026082840-CVE-2026-80636-32e4@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c56716c69ce1ac320432fb1ea5654196ba24d2f8,6bba4846f196d081bf553391d12b5a73dcc48685)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c56716c69ce1ac320432fb1ea5654196ba24d2f8,61eab1d0237eb513fe73e391a5926ee70092c325)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c56716c69ce1ac320432fb1ea5654196ba24d2f8,d53eecbca16f056abba274075cb15120ab062518)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c56716c69ce1ac320432fb1ea5654196ba24d2f8,a052a94bcc629acaecc2ce42a4af77f8fa399757)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c56716c69ce1ac320432fb1ea5654196ba24d2f8,35e21a4dccc5c255ba59ccfbfeb4629ed21da972)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.19)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T09:30:18.290406+00:00", "updated": "2026-08-31T14:15:06.423449+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}