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
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6623 records in the last 180 days details
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)
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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."
          }
        ],
        "id": "CVE-2026-80792",
        "lastModified": "2026-09-04T16:18:05.460",
        "metrics": {},
        "published": "2026-09-04T16:18:05.460",
        "references": [
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          },
          {
            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-08T21:17:24+00:00",
      "cve": "CVE-2026-80792",
      "id": "CVE-2026-80792",
      "initial_release_date": "2026-09-04T00:00:00+00:00",
      "product_status:fixed": "841",
      "product_status:known_affected": "100",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: fix use-after-free in ip6_finish_output2()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80792.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:08:27Z",
      "cve": "CVE-2026-80792",
      "id": "CVE-2026-80792",
      "initial_release_date": "2026-09-08T23:58:53Z",
      "product_status:known_affected": "114",
      "product_status:known_not_affected": "239",
      "product_status:recommended": "4",
      "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": "4"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.