{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93805","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-18T17:59:28.790Z","datePublished":"2026-09-24T16:02:39.248Z","dateUpdated":"2026-10-03T10:57:38.089Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T10:57:38.089Z"},"descriptions":[{"lang":"en","value":"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."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/mlme.c"],"versions":[{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a","status":"affected","versionType":"git"},{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"ce2a3be6909462f49c34de96be71f0ad5f0d573f","status":"affected","versionType":"git"},{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"6bdf4dcff98df634e04ebf99f52027a48d7f78ff","status":"affected","versionType":"git"},{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"0ec738a0d361d7eb37188117166d201f9df622d3","status":"affected","versionType":"git"},{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"8f4127a93cf60d561ad39849a9ac763ba0e14db5","status":"affected","versionType":"git"},{"version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","lessThan":"d5e4586546974179feca305a94e07fac3e9727fe","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/wireless/mlme.c"],"versions":[{"version":"2.6.32","status":"affected"},{"version":"0","lessThan":"2.6.32","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.32","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/6eb4bd50be53f5afbabb3a3b5153276e08fa7a4a"},{"url":"https://git.kernel.org/stable/c/ce2a3be6909462f49c34de96be71f0ad5f0d573f"},{"url":"https://git.kernel.org/stable/c/6bdf4dcff98df634e04ebf99f52027a48d7f78ff"},{"url":"https://git.kernel.org/stable/c/0ec738a0d361d7eb37188117166d201f9df622d3"},{"url":"https://git.kernel.org/stable/c/8f4127a93cf60d561ad39849a9ac763ba0e14db5"},{"url":"https://git.kernel.org/stable/c/d5e4586546974179feca305a94e07fac3e9727fe"}],"title":"wifi: cfg80211: validate rx/tx MLME callback frame lengths before access","x_generator":{"engine":"bippy-1.2.0"}}}}