CVE-2026-93806

{"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 \u2192 ieee80211_sta_rx_queued_frame \u2192 ieee80211_rx_mgmt_assoc_resp, or by mwifiex_ret_802_11_associate \u2192 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() \u2192 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 \u2014 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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-93806", "lastModified": "2026-10-03T11:17:50.320", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-24T17:17:13.570", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71be658246c903b9e96976a23c23800675896a1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/78ac450ad4624d6b2999cb4eeb28916767f81247"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a57310600c1e2b9ada0f37c96e8f48aef47d3093"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b760113aeca2e9362d56bf9e9263373ffe6c8eb3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: wifi: cfg80211: validate assoc response length before status and IE access", "id": "2540423", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2540423"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: cfg80211: validate assoc response length before status and IE access\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.\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.", "A flaw was found in the Linux kernel's cfg80211 wireless subsystem. An attacker within Wi-Fi range could cause a Denial of Service (DoS) by sending a truncated association response frame. The wireless component accesses status and information fields before verifying that the received management frame is long enough, causing an out-of-bounds memory read that can crash the system."], "name": "CVE-2026-93806", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93806\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93806\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93806.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,a57310600c1e2b9ada0f37c96e8f48aef47d3093)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,78ac450ad4624d6b2999cb4eeb28916767f81247)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,b760113aeca2e9362d56bf9e9263373ffe6c8eb3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.53)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-24T22:00:19.926394+00:00", "updated": "2026-10-01T20:45:12.587421+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}