{"api_version":"1","generated_at":"2026-09-14T04:31:50+00:00","cve":"CVE-2026-80792","urls":{"html":"https://cve.report/CVE-2026-80792","api":"https://cve.report/api/cve/CVE-2026-80792.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80792","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80792"},"summary":{"title":"ipv6: fix use-after-free in ip6_finish_output2()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 16:18:05","updated_at":"2026-09-04 16:18:05"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a","name":"https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515","name":"https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f","name":"https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e","name":"https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed","name":"https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43","name":"https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862","name":"https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3","name":"https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a","name":"https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80792","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80792","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 75e0a544ebe9af663ef53ca21e9e9185c51fb54a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 c95f01b78266828a57060d754fcbfc92123a98ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 d960881b9312e781a3429aabceb223ce6b7c882f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 087ee0d914aaae929f1660c9ca878e367655ba1a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.233 5.10.267 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.289 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.267 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.218 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.185 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.154 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.106 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.47 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.11 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.1 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80792","cve":"CVE-2026-80792","epss":"0.001950000","percentile":"0.092810000","score_date":"2026-09-07","updated_at":"2026-09-08 00:05:27"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.267","versionStartIncluding":"5.10.233","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.218","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.185","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.154","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.106","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.47","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.11","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.1","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.289","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-04T15:13:04.537Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/75e0a544ebe9af663ef53ca21e9e9185c51fb54a"},{"url":"https://git.kernel.org/stable/c/c95f01b78266828a57060d754fcbfc92123a98ed"},{"url":"https://git.kernel.org/stable/c/d960881b9312e781a3429aabceb223ce6b7c882f"},{"url":"https://git.kernel.org/stable/c/087ee0d914aaae929f1660c9ca878e367655ba1a"},{"url":"https://git.kernel.org/stable/c/3c770ac4e6f07af7c7b40c474a3efc61ffed7862"},{"url":"https://git.kernel.org/stable/c/3dc98e5fe82d069dd29b124ffbdb679331dfea43"},{"url":"https://git.kernel.org/stable/c/99219c82804f266189388e8bf1cf5135d10d5515"},{"url":"https://git.kernel.org/stable/c/73a187384a8c8b983c7fea046d716b6752a1e7a3"},{"url":"https://git.kernel.org/stable/c/d0d48d999b0eee6bb176ef4e39d9be868fa80f7e"}],"title":"ipv6: fix use-after-free in ip6_finish_output2()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80792","datePublished":"2026-09-04T15:13:04.537Z","dateReserved":"2026-08-26T14:34:25.793Z","dateUpdated":"2026-09-04T15:13:04.537Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 16:18:05","lastModifiedDate":"2026-09-04 16:18:05","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80792","Ordinal":"1","Title":"ipv6: fix use-after-free in ip6_finish_output2()","CVE":"CVE-2026-80792","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80792","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"ipv6: fix use-after-free in ip6_finish_output2()"}]}}}