{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6829c878ecd24ff0ae41b4668c7e9d0f11b66942"
            },
            {
              "fixed": "0ec738a0d361d7eb37188117166d201f9df622d3"
            },
            {
              "fixed": "8f4127a93cf60d561ad39849a9ac763ba0e14db5"
            },
            {
              "fixed": "d5e4586546974179feca305a94e07fac3e9727fe"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.32"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93805.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate rx/tx MLME callback frame lengths before access\n\ncfg80211_rx_mlme_mgmt() and cfg80211_tx_mlme_mgmt() call tracepoints\nbefore rejecting frames shorter than the frame-control field. After\nthat, they only require len \u003e= 2 before dispatching into subtype\nhandlers that assume their fixed fields are present.\n\nThe frames that trip this are not shorter than 2 bytes; they are short\nrelative to their subtype. mwifiex is a concrete in-tree example on the\nlength side: mwifiex_process_mgmt_packet() only requires a 4-address\nieee80211_hdr plus the 2-byte firmware length prefix before handing the\nframe to cfg80211_rx_mlme_mgmt(). After stripping the length prefix and\nremoving addr4, pkt_len can be exactly 24: a bare 3-address management\nheader with no reason-code body. The existing WARN_ON(len \u003c 2) does not\nfire on such a frame, and cfg80211_process_deauth() then reads\nu.deauth.reason_code as a two-byte access starting at offset 24,\nimmediately past the 24-byte buffer.\n\nAdd a frame-control length gate, then validate each subtype's minimum\nframe size in an if/else-if chain that mirrors the dispatch logic. Trace\nonly after the frame is known to be well-formed.\n\nSide effects of this change:\n - The WARN_ON(len \u003c 2) is dropped. It only guarded the frame_control\n   read, never the subtype fixed fields, and it does not fire on the\n   frames that actually trigger the out-of-bounds read (which are \u003e= 2).\n   The len \u003e= 2 check is kept as the guard before dereferencing\n   frame_control, but without the warning: these are exported callbacks\n   and a malformed frame from a driver should be dropped silently rather\n   than backtraced.\n - cfg80211_tx_mlme_mgmt() previously routed every non-deauth subtype\n   through disassociation handling; it now silently ignores unrecognised\n   subtypes.",
  "id": "CVE-2026-93805",
  "modified": "2026-09-27T03:30:12.159536813Z",
  "published": "2026-09-24T16:02:39.248Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ec738a0d361d7eb37188117166d201f9df622d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f4127a93cf60d561ad39849a9ac763ba0e14db5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5e4586546974179feca305a94e07fac3e9727fe"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93805.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93805"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "wifi: cfg80211: validate rx/tx MLME callback frame lengths before access"
}