CVE-2026-80792 (GCVE-0-2026-80792)
Vulnerability from cvelistv5
Published
2026-09-04 15:13
Modified
2026-10-19 08:43
Severity ?
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.
Impacted products
Vendor Product Version
Linux Linux Version: 4132c4ad00ddbf3a175ea0d2c775b662a32f4c85
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: e415ed3a4b8b246ee5e9d109ff5153efcf96b9f2
Version: 1598154fd28ffa4a55beae1970475fd6776554b6
Version: 5.10.233   ≤
Version: 5.4.289   ≤
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{
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "lessThanOrEqual": "6.6.*",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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      "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": "2026-10-19T08:43:45.535Z",
        "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"
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        {
          "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": "2026-10-19T08:43:45.535Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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