{"id":"CVE-2026-93805","revision":"5ec56a2cd8294b728128e3c3d8fb6eb4","records":[{"revision":"5ec56a2cd8294b728128e3c3d8fb6eb4","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93805","aliases":[],"title":"wifi: cfg80211: validate rx/tx MLME callback frame lengths before access","description":"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 >= 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.","state":0,"publishedAt":"2026-09-24T16:02:39.248+00:00","modifiedAt":"2026-10-03T10:57:38.089+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/wireless/mlme.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"ce2a3be6909462f49c34de96be71f0ad5f0d573f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"6bdf4dcff98df634e04ebf99f52027a48d7f78ff\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"0ec738a0d361d7eb37188117166d201f9df622d3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"8f4127a93cf60d561ad39849a9ac763ba0e14db5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6829c878ecd24ff0ae41b4668c7e9d0f11b66942\",\n \"lessThan\": \"d5e4586546974179feca305a94e07fac3e9727fe\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/wireless/mlme.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.32\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.32\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.222\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.189\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.158\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.111\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.53\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a","https://git.kernel.org/stable/c/ce2a3be6909462f49c34de96be71f0ad5f0d573f","https://git.kernel.org/stable/c/6bdf4dcff98df634e04ebf99f52027a48d7f78ff","https://git.kernel.org/stable/c/0ec738a0d361d7eb37188117166d201f9df622d3","https://git.kernel.org/stable/c/8f4127a93cf60d561ad39849a9ac763ba0e14db5","https://git.kernel.org/stable/c/d5e4586546974179feca305a94e07fac3e9727fe"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93805","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93805","identifiers":["CVE-2026-93805"]},"retained":false,"historicalAffected":[]}],"coverage":[]}