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

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-10-19 08:43
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 53/100 over 7061 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 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          }
        ],
        "id": "CVE-2026-80792",
        "lastModified": "2026-10-19T09:17:13.330",
        "metrics": {},
        "published": "2026-09-04T16:18:05.460",
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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": "2026-10-16T17:13:31+00:00",
      "cve": "CVE-2026-80792",
      "id": "CVE-2026-80792",
      "initial_release_date": "2026-09-04T00:00:00+00:00",
      "product_status:fixed": "1148",
      "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": "2026-10-20T01:23:34Z",
      "cve": "CVE-2026-80792",
      "id": "CVE-2026-80792",
      "initial_release_date": "2026-09-08T23:58:53Z",
      "product_status:known_affected": "115",
      "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/2026/cve-2026-80792.json",
      "version": "5"
    }
  }
}



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