{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80792", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.793Z", "datePublished": "2026-09-04T15:13:04.537Z", "dateUpdated": "2026-09-04T15:13:04.537Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-04T15:13:04.537Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix use-after-free in ip6_finish_output2()\n\nip6_finish_output2() caches a pointer to the IPv6 destination\naddress (daddr) before invoking lwtunnel_xmit(). The LWT-BPF\ntransmit path or other encapsulation operations within\nlwtunnel_xmit() can reallocate the skb head, freeing the memory\nthat daddr points to. When lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, the function continues to use the stale\ndaddr pointer to compute the nexthop and to look up or create the\nneighbour entry. This results in a use-after-free read, which can\nleak sensitive kernel data, pollute the neighbour table with\narbitrary values, misdirect traffic, or crash the system.\n\nFix this by re-fetching the IPv6 header and the destination\naddress pointer after lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop\ncomputation and neighbour lookup operate on valid memory."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_output.c"], "versions": [{"version": "4132c4ad00ddbf3a175ea0d2c775b662a32f4c85", "lessThan": "75e0a544ebe9af663ef53ca21e9e9185c51fb54a", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "c95f01b78266828a57060d754fcbfc92123a98ed", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "d960881b9312e781a3429aabceb223ce6b7c882f", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "087ee0d914aaae929f1660c9ca878e367655ba1a", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "3c770ac4e6f07af7c7b40c474a3efc61ffed7862", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "3dc98e5fe82d069dd29b124ffbdb679331dfea43", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "99219c82804f266189388e8bf1cf5135d10d5515", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "73a187384a8c8b983c7fea046d716b6752a1e7a3", "status": "affected", "versionType": "git"}, {"version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "lessThan": "d0d48d999b0eee6bb176ef4e39d9be868fa80f7e", "status": "affected", "versionType": "git"}, {"version": "1598154fd28ffa4a55beae1970475fd6776554b6", "status": "affected", "versionType": "git"}, {"version": "5.10.233", "lessThan": "5.10.267", "status": "affected", "versionType": "semver"}, {"version": "5.4.289", "lessThan": "5.5", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_output.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.267", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.218", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.185", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.154", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.106", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.47", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.11", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.1", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "5.10.233", "versionEndExcluding": "5.10.267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.218"}, {"vulnerable": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/ip6_output.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "75e0a544ebe9af663ef53ca21e9e9185c51fb54a", "status": "affected", "version": "4132c4ad00ddbf3a175ea0d2c775b662a32f4c85", "versionType": "git"}, {"lessThan": "c95f01b78266828a57060d754fcbfc92123a98ed", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "d960881b9312e781a3429aabceb223ce6b7c882f", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "087ee0d914aaae929f1660c9ca878e367655ba1a", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "3c770ac4e6f07af7c7b40c474a3efc61ffed7862", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "3dc98e5fe82d069dd29b124ffbdb679331dfea43", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "99219c82804f266189388e8bf1cf5135d10d5515", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "73a187384a8c8b983c7fea046d716b6752a1e7a3", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"lessThan": "d0d48d999b0eee6bb176ef4e39d9be868fa80f7e", "status": "affected", "version": "e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2", "versionType": "git"}, {"status": "affected", "version": "1598154fd28ffa4a55beae1970475fd6776554b6", "versionType": "git"}, {"lessThan": "5.10.267", "status": "affected", "version": "5.10.233", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.289", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/ip6_output.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.267", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.218", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.185", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.154", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.106", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.47", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.11", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.1", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "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\nipv6: fix use-after-free in ip6_finish_output2()\n\nip6_finish_output2() caches a pointer to the IPv6 destination\naddress (daddr) before invoking lwtunnel_xmit(). The LWT-BPF\ntransmit path or other encapsulation operations within\nlwtunnel_xmit() can reallocate the skb head, freeing the memory\nthat daddr points to. When lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, the function continues to use the stale\ndaddr pointer to compute the nexthop and to look up or create the\nneighbour entry. This results in a use-after-free read, which can\nleak sensitive kernel data, pollute the neighbour table with\narbitrary values, misdirect traffic, or crash the system.\n\nFix this by re-fetching the IPv6 header and the destination\naddress pointer after lwtunnel_xmit() returns\nLWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop\ncomputation and neighbour lookup operate on valid memory."}], "id": "CVE-2026-80792", "lastModified": "2026-09-04T16:18:05.460", "metrics": {}, "published": "2026-09-04T16:18:05.460", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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