{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93806", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-18T17:59:28.790Z", "datePublished": "2026-09-24T16:02:40.159Z", "dateUpdated": "2026-10-03T10:57:39.214Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-03T10:57:39.214Z" }, "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": { "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" }, "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." } ] } ], "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": "3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac", "status": "affected", "versionType": "git" }, { "version": "6829c878ecd24ff0ae41b4668c7e9d0f11b66942", "lessThan": "71be658246c903b9e96976a23c23800675896a1b", "status": "affected", "versionType": "git" }, { "version": "6829c878ecd24ff0ae41b4668c7e9d0f11b66942", "lessThan": "a57310600c1e2b9ada0f37c96e8f48aef47d3093", "status": "affected", "versionType": "git" }, { "version": "6829c878ecd24ff0ae41b4668c7e9d0f11b66942", "lessThan": "78ac450ad4624d6b2999cb4eeb28916767f81247", "status": "affected", "versionType": "git" }, { "version": "6829c878ecd24ff0ae41b4668c7e9d0f11b66942", "lessThan": "b760113aeca2e9362d56bf9e9263373ffe6c8eb3", "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": "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": "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/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" } } } }