{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "f60e5990d9c1424af9dbca60a23ba2a1c7c1ce90"
            },
            {
              "fixed": "97133c4d42654578fab95abe47359ebe784dde18"
            },
            {
              "fixed": "f625c742b33dc137c209dd13d1c5f12b1c18d71c"
            },
            {
              "fixed": "ad7fa2f411cb30f63d6725f111be134064cdb718"
            },
            {
              "fixed": "d2adc4e80b29e58b5162ae09f0f657a215806c8c"
            },
            {
              "fixed": "ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"
            },
            {
              "fixed": "c8f256dc849205ccb2bd78bd99a3497b972b44e0"
            },
            {
              "fixed": "0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"
            },
            {
              "fixed": "b8a39a09ae4eaae04309e1e38ed6a1101d967496"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "c91f81773cd4bbebfe744e9ab30a7ce093f9b930"
            },
            {
              "last_affected": "c8c30b2b17f2133e953850c547e3902c3a3d80e2"
            },
            {
              "last_affected": "3fe207e4637a2e792c46a08666aa722f77d7f8f7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3.14.40"
            },
            {
              "fixed": "3.15"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3.18.13"
            },
            {
              "fixed": "3.19"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "3.19.6"
            },
            {
              "fixed": "3.20"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "5.10.265"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.216"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.183"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.152"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.104"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove WARN_ON_ONCE() from sk_mc_loop()\n\nsk_mc_loop() can be called for sockets that are neither AF_INET\nnor AF_INET6 (e.g. AF_PACKET sockets when sending packets via raw/packet\nsocket over virtual devices such as VRF or ipvlan).\n\nIn such cases, sk_family is not AF_INET/AF_INET6 and sk_mc_loop() falls\nthrough the switch statement and triggers WARN_ON_ONCE(1).\n\nNon-INET sockets do not support IP_MULTICAST_LOOP or IPV6_MULTICAST_LOOP\noptions, so loopback should default to true without generating a warning.",
  "id": "CVE-2026-80733",
  "modified": "2026-09-05T03:30:29.811943340Z",
  "published": "2026-09-03T08:21:50.136Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d75f2c1d0764efa756ad9c1e078d8c09ea8fc1f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/97133c4d42654578fab95abe47359ebe784dde18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad7dbb1d14b1b4406eca8ef9478e8de312ba0cfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad7fa2f411cb30f63d6725f111be134064cdb718"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8a39a09ae4eaae04309e1e38ed6a1101d967496"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c8f256dc849205ccb2bd78bd99a3497b972b44e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2adc4e80b29e58b5162ae09f0f657a215806c8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f625c742b33dc137c209dd13d1c5f12b1c18d71c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80733.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80733"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net: remove WARN_ON_ONCE() from sk_mc_loop()"
}