wifi: mac80211: validate deauth frame length before reason access

{
  "id": "4bf1ac956abab371996f29124d12f3ab75c0a3527aa45707111d8f71505f4a6b",
  "url": "https://www.cve.org/CVERecord?id=CVE-2026-98891",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: mac80211: validate deauth frame length before reason access",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: validate deauth frame length before reason access ieee80211_rx_mgmt_deauth() reads the deauth reason code before checking that the fixed field is actually present in the received frame. Validate the deauth frame length first and only then read the reason code.",
    "evidence": "cve:CVE-2026-98891",
    "products": [
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/0/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      },
      {
        "name": {
          "value": "Linux",
          "evidence": "/containers/cna/affected/1/product"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98891",
      "aliases": [
        "CVE-2026-98891"
      ],
      "metrics": [],
      "affected": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "51092dc769f021e9634474e1bd5a561da477fbdb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "80d1a110e9096b5bf41497f6b151154084862385",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "a78689e2beed200d4590318612c74ae25c9408cf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "7a5ef1fd654d0e90d59aa32c881789c8bcc4125a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "9df64ad43e1f2c036667bba2bf385e9d7b3af564",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c9c99f8938e41b878802d5d8481d6f7a212515b0",
              "lessThan": "4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/mac80211/mlme.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mac80211/mlme.c"
          ],
          "defaultStatus": "affected"
        }
      ],
      "modified": "2026-10-26T06:56:16.835Z",
      "provider": "cve",
      "references": [
        "https://git.kernel.org/stable/c/51092dc769f021e9634474e1bd5a561da477fbdb",
        "https://git.kernel.org/stable/c/a6ed4c00ccdc15011a73daa2b38af9fc5a2c543e",
        "https://git.kernel.org/stable/c/80d1a110e9096b5bf41497f6b151154084862385",
        "https://git.kernel.org/stable/c/a78689e2beed200d4590318612c74ae25c9408cf",
        "https://git.kernel.org/stable/c/7a5ef1fd654d0e90d59aa32c881789c8bcc4125a",
        "https://git.kernel.org/stable/c/9df64ad43e1f2c036667bba2bf385e9d7b3af564",
        "https://git.kernel.org/stable/c/4a360c6e18dfa9d70006c7247a6a8cc8dfe0d60f"
      ],
      "provider_metadata": {
        "cna": {
          "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "shortName": "Linux",
          "dateUpdated": "2026-10-26T06:56:16.835Z"
        }
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98891",
        "evidence": "/cveMetadata/cveId"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-cve",
  "document_id": 263349,
  "published_at": "2026-10-23T11:37:51.588+00:00"
}