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CVE-2026-80792 (GCVE-0-2026-80792)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
ipv6: fix use-after-free in ip6_finish_output2()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix use-after-free in ip6_finish_output2() ip6_finish_output2() caches a pointer to the IPv6 destination address (daddr) before invoking lwtunnel_xmit(). The LWT-BPF transmit path or other encapsulation operations within lwtunnel_xmit() can reallocate the skb head, freeing the memory that daddr points to. When lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, the function continues to use the stale daddr pointer to compute the nexthop and to look up or create the neighbour entry. This results in a use-after-free read, which can leak sensitive kernel data, pollute the neighbour table with arbitrary values, misdirect traffic, or crash the system. Fix this by re-fetching the IPv6 header and the destination address pointer after lwtunnel_xmit() returns LWTUNNEL_XMIT_CONTINUE, ensuring that the subsequent nexthop computation and neighbour lookup operate on valid memory.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85 , < 75e0a544ebe9af663ef53ca21e9e9185c51fb54a (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < c95f01b78266828a57060d754fcbfc92123a98ed (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < d960881b9312e781a3429aabceb223ce6b7c882f (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 087ee0d914aaae929f1660c9ca878e367655ba1a (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 3c770ac4e6f07af7c7b40c474a3efc61ffed7862 (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 3dc98e5fe82d069dd29b124ffbdb679331dfea43 (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 99219c82804f266189388e8bf1cf5135d10d5515 (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < 73a187384a8c8b983c7fea046d716b6752a1e7a3 (git)
Affected: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2 , < d0d48d999b0eee6bb176ef4e39d9be868fa80f7e (git)
Affected: 1598154fd28ffa4a55beae1970475fd6776554b6 (git)
Affected: 5.10.233 , < 5.10.267 (semver)
Affected: 5.4.289 , < 5.5 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.218 , ≤ 5.15.* (semver)
Unaffected: 6.1.185 , ≤ 6.1.* (semver)
Unaffected: 6.6.154 , ≤ 6.6.* (semver)
Unaffected: 6.12.106 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
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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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4132c4ad00ddbf3a175ea0d2c775b662a32f4c85\",\"lessThan\":\"75e0a544ebe9af663ef53ca21e9e9185c51fb54a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"c95f01b78266828a57060d754fcbfc92123a98ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"d960881b9312e781a3429aabceb223ce6b7c882f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"087ee0d914aaae929f1660c9ca878e367655ba1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"3c770ac4e6f07af7c7b40c474a3efc61ffed7862\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"3dc98e5fe82d069dd29b124ffbdb679331dfea43\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"99219c82804f266189388e8bf1cf5135d10d5515\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"73a187384a8c8b983c7fea046d716b6752a1e7a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2\",\"lessThan\":\"d0d48d999b0eee6bb176ef4e39d9be868fa80f7e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1598154fd28ffa4a55beae1970475fd6776554b6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.233\",\"lessThan\":\"5.10.267\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.289\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_output.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.267\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.218\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.11\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.1\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:51:33Z",
      "cve": "CVE-2026-80792",
      "id": "CVE-2026-80792",
      "initial_release_date": "2026-09-08T23:58:53Z",
      "product_status:known_affected": "102",
      "product_status:known_not_affected": "239",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80792",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80792.json",
      "version": "3"
    }
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.