{"api_version":"1","generated_at":"2026-10-26T07:14:27+00:00","cve":"CVE-2026-93806","urls":{"html":"https://cve.report/CVE-2026-93806","api":"https://cve.report/api/cve/CVE-2026-93806.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93806","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93806"},"summary":{"title":"wifi: cfg80211: validate assoc response length before status and IE access","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate assoc response length before status and IE access\n\ncfg80211_rx_assoc_resp() initialises the status and response-IE fields\nof cfg80211_connect_resp_params from the management frame before\nproving that the frame is long enough for those offsets. S1G and\nregular association responses also have different IE offsets, but the\nS1G path only patched resp_ie after the unsafe initialiser had already\nrun.\n\nDefer resp_ie, resp_ie_len, and status to after the link-iteration\nloop. Use a bool to remember whether the frame is S1G, then validate\nthe appropriate minimum length and set all three fields in a single\nif/else block. Funnel short-frame and SME-reject cleanup through a\nshared free_bss label for the abandon paths.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 17:17:13","updated_at":"2026-10-03 11:17:50"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/71be658246c903b9e96976a23c23800675896a1b","name":"https://git.kernel.org/stable/c/71be658246c903b9e96976a23c23800675896a1b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a57310600c1e2b9ada0f37c96e8f48aef47d3093","name":"https://git.kernel.org/stable/c/a57310600c1e2b9ada0f37c96e8f48aef47d3093","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/78ac450ad4624d6b2999cb4eeb28916767f81247","name":"https://git.kernel.org/stable/c/78ac450ad4624d6b2999cb4eeb28916767f81247","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b760113aeca2e9362d56bf9e9263373ffe6c8eb3","name":"https://git.kernel.org/stable/c/b760113aeca2e9362d56bf9e9263373ffe6c8eb3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac","name":"https://git.kernel.org/stable/c/3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93806","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93806","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 71be658246c903b9e96976a23c23800675896a1b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 a57310600c1e2b9ada0f37c96e8f48aef47d3093 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 78ac450ad4624d6b2999cb4eeb28916767f81247 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6829c878ecd24ff0ae41b4668c7e9d0f11b66942 b760113aeca2e9362d56bf9e9263373ffe6c8eb3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.32","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.32 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.189 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"93806","cve":"CVE-2026-93806","epss":"0.002540000","percentile":"0.153550000","score_date":"2026-10-05","updated_at":"2026-10-06 00:14:18"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/wireless/mlme.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac","status":"affected","version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","versionType":"git"},{"lessThan":"71be658246c903b9e96976a23c23800675896a1b","status":"affected","version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","versionType":"git"},{"lessThan":"a57310600c1e2b9ada0f37c96e8f48aef47d3093","status":"affected","version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","versionType":"git"},{"lessThan":"78ac450ad4624d6b2999cb4eeb28916767f81247","status":"affected","version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","versionType":"git"},{"lessThan":"b760113aeca2e9362d56bf9e9263373ffe6c8eb3","status":"affected","version":"6829c878ecd24ff0ae41b4668c7e9d0f11b66942","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/wireless/mlme.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.32"},{"lessThan":"2.6.32","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"2.6.32","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"2.6.32","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate assoc response length before status and IE access\n\ncfg80211_rx_assoc_resp() initialises the status and response-IE fields\nof cfg80211_connect_resp_params from the management frame before\nproving that the frame is long enough for those offsets. S1G and\nregular association responses also have different IE offsets, but the\nS1G path only patched resp_ie after the unsafe initialiser had already\nrun.\n\nDefer resp_ie, resp_ie_len, and status to after the link-iteration\nloop. Use a bool to remember whether the frame is S1G, then validate\nthe appropriate minimum length and set all three fields in a single\nif/else block. Funnel short-frame and SME-reject cleanup through a\nshared free_bss label for the abandon paths."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - The malformed input is an 802.11 (Re)Association Response in data->buf that cfg80211_rx_assoc_resp() parses as ieee80211_mgmt. It is delivered by ieee80211_rx_h_mgmt → ieee80211_sta_rx_queued_frame → ieee80211_rx_mgmt_assoc_resp, or by mwifiex_ret_802_11_associate → mwifiex_process_assoc_resp. Those frames are WiFi radio-range, not a routable IP protocol.\nAC:L - mwifiex_ret_802_11_associate copies resp->params of length (resp->size - S_DS_GEN) into assoc_rsp_buf with no 30-byte floor; mwifiex_process_assoc_resp then calls cfg80211_rx_assoc_resp with that len. A rogue AP's truncated AssocResp makes data->len < offsetof(ieee80211_mgmt, u.assoc_resp.variable), so the size_t subtraction for cr.resp_ie_len wraps every time. No race.\nPR:N - cfg80211_rx_assoc_resp runs on the station MLME RX path. ieee80211_rx_mgmt_assoc_resp only requires ifmgd->assoc_data and matching SA/BSSID; mwifiex_host_mlme_work_queue has no capable() or uid check. The AssocResp is parsed before the 4-way handshake, so a radio attacker needs no host account or PSK.\nUI:N - A saved-network auto-reconnect or evil-twin of a known SSID puts ifmgd->assoc_data / the mwifiex associate command in flight; the attacker's AssocResp is then handled in ieee80211_rx_mgmt_assoc_resp or mwifiex_process_assoc_resp with no further victim click.\nS:U - The underflowed cr.resp_ie_len is consumed in nl80211_send_connect_result() → nla_put(NL80211_ATTR_RESP_IE) / __nla_put() on host-kernel heap (the nlmsg skb and adjacent objects). No VM, IOMMU, or sandbox boundary is crossed.\nC:H - When data->len < 30, cr.resp_ie_len = data->len - offsetof(ieee80211_mgmt, u.assoc_resp.variable) wraps. nl80211_send_connect_result() then nla_put(NL80211_ATTR_RESP_IE, that length, cr.resp_ie) and __nla_put memcpy's from mgmt->u.assoc_resp.variable, disclosing kernel memory far past the short frame; status_code at offset 26 is also an OOB load.\nI:H - nlmsg_new(100 + cr->resp_ie_len + ...) in nl80211_send_connect_result wraps the skb allocation small when resp_ie_len underflows. nla_put then passes that length as int into __nla_put, whose memcpy writes past the skb, and __nla_reserve memset's at the wrapped u16 nla_len — a kernel heap overflow write.\nA:H - The same __nla_put memcpy of the wrapped cr.resp_ie_len, or __nla_reserve's memset at the wrapped u16 nla_len, can walk into unmapped or redzone memory and oops/panic. Repeating association retriggers it."}]}],"providerMetadata":{"dateUpdated":"2026-10-03T10:57:39.214Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac"},{"url":"https://git.kernel.org/stable/c/71be658246c903b9e96976a23c23800675896a1b"},{"url":"https://git.kernel.org/stable/c/a57310600c1e2b9ada0f37c96e8f48aef47d3093"},{"url":"https://git.kernel.org/stable/c/78ac450ad4624d6b2999cb4eeb28916767f81247"},{"url":"https://git.kernel.org/stable/c/b760113aeca2e9362d56bf9e9263373ffe6c8eb3"}],"title":"wifi: cfg80211: validate assoc response length before status and IE access","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93806","datePublished":"2026-09-24T16:02:40.159Z","dateReserved":"2026-09-18T17:59:28.790Z","dateUpdated":"2026-10-03T10:57:39.214Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 17:17:13","lastModifiedDate":"2026-10-03 11:17:50","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93806","Ordinal":"1","Title":"wifi: cfg80211: validate assoc response length before status and","CVE":"CVE-2026-93806","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93806","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: cfg80211: validate assoc response length before status and IE access\n\ncfg80211_rx_assoc_resp() initialises the status and response-IE fields\nof cfg80211_connect_resp_params from the management frame before\nproving that the frame is long enough for those offsets. S1G and\nregular association responses also have different IE offsets, but the\nS1G path only patched resp_ie after the unsafe initialiser had already\nrun.\n\nDefer resp_ie, resp_ie_len, and status to after the link-iteration\nloop. Use a bool to remember whether the frame is S1G, then validate\nthe appropriate minimum length and set all three fields in a single\nif/else block. Funnel short-frame and SME-reject cleanup through a\nshared free_bss label for the abandon paths.","Type":"Description","Title":"wifi: cfg80211: validate assoc response length before status and"}]}}}