{ "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" } } } }