{"id":"CVE-2026-93805","title":"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 s…","summary":"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 s…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < 6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a","Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < ce2a3be6909462f49c34de96be71f0ad5f0d573f","Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < 6bdf4dcff98df634e04ebf99f52027a48d7f78ff","Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < 0ec738a0d361d7eb37188117166d201f9df622d3","Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < 8f4127a93cf60d561ad39849a9ac763ba0e14db5","Linux >= 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 < d5e4586546974179feca305a94e07fac3e9727fe","Linux 2.6.32"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:50.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93805","references":[{"url":"https://git.kernel.org/stable/c/0ec738a0d361d7eb37188117166d201f9df622d3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6bdf4dcff98df634e04ebf99f52027a48d7f78ff","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8f4127a93cf60d561ad39849a9ac763ba0e14db5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce2a3be6909462f49c34de96be71f0ad5f0d573f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5e4586546974179feca305a94e07fac3e9727fe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93805.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-93805"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540380"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93805"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93805"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93805.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00173,"epssPercentile":0.06618,"ingestedAt":"2026-09-24T16:47:15.897Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-125"],"slug":"CVE-2026-93805","body":"## Overview\n\nIn 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 >= 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 < 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 < 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 >= 2).\n   The len >= 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93805.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224298,"id":"CVE-2026-93805","ts":1792325077490,"field":"cvss","old":null,"new":"5.5"},{"seq":224297,"id":"CVE-2026-93805","ts":1792325077490,"field":"severity","old":"none","new":"medium"}]}