CVE-2026-89524

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89524", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.719Z", "datePublished": "2026-09-11T19:44:05.548Z", "dateUpdated": "2026-10-19T08:48:15.538Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:15.538Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets\n\nath6kl_cfg80211_connect_event() subtracts fixed IE offsets from\nassoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower\nbound. The aggregate check recently added to ath6kl_wmi_connect_event_rx()\nbounds the declared lengths from above (their sum must fit the received\nevent), but an assoc request/response shorter than its fixed offset still\nunderflows here: the u8 wraps to ~250, and cfg80211_connect_result() /\ncfg80211_roamed() then treat that wrapped value as the IE length and copy\nthat many bytes out of the small assoc_info buffer to user space via\nnl80211, disclosing adjacent slab memory.\n\nClamp both lengths to their offsets before subtracting.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing lower bound is evident from source. Compile-tested."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - ath6kl is a fullMAC WiFi driver; assoc_req_len/assoc_resp_len come from a WMI_CONNECT_EVENT built from the 802.11 association exchange. A rogue or evil-twin AP, or a frame injector in radio range, supplies a truncated assoc/reassoc response, so the attacker must share the wireless segment.\nAC:L - A malicious AP can send a truncated association or reassociation response so firmware reports assoc_req_len < 4 or assoc_resp_len < 6. The u8 subtraction wraps deterministically and cfg80211 copies the wrapped length; the attacker can force (re)association or roaming with deauth until the event is emitted.\nPR:N - The WMI connect event is handled on the firmware receive path with no capability check, local account, or user-namespace gate. An adjacent attacker needs no privileges on the victim system.\nUI:N - Devices with a saved or open profile auto-associate, and the SME_CONNECTED roam path (cfg80211_roamed) delivers the same underflowed IEs while already connected, so no extra victim action is required.\nS:U - The out-of-bounds read, kernel-memory disclosure, and any resulting oops stay inside the host kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After the u8 wrap, cfg80211_connect_result()/cfg80211_roamed() treat ~250-byte lengths as IE sizes and copy that many bytes from the small assoc_info skb into nl80211 CONNECT/ROAM events (and WEXT assoc IE events), disclosing adjacent slab memory far beyond a few bytes.\nI:N - The underflow only inflates the length used for an out-of-bounds read and copy to userspace; no kernel memory is written out of bounds and no attacker-controlled pointer is used to modify kernel state.\nA:H - Copying ~250 bytes past a short WMI skb can walk off the slab object into unmapped or redzoned memory, causing a kernel oops or KASAN panic that an adjacent attacker can retrigger by repeating association."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath6kl/cfg80211.c"], "versions": [{"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "225587bdbf4b0eb5265a71ee4dc183561a1857fc", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "d337213a889705a69735079606d0b4c672b17605", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "e11d5ae96d5e52cb48fa27c6ad352d766d0322fb", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "e3619bed5da125713b29ac881dc66f5e06606f88", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "e1330d719c047c4d8190a16be034b29fc601a815", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "8eb73016fb3968cf2db3987a92764563a3af773a", "status": "affected", "versionType": "git"}, {"version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "lessThan": "3bbd05723d15dd06f0560bcd94fbf9a91b5f5613", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath6kl/cfg80211.c"], "versions": [{"version": "3.2", "status": "affected"}, {"version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "3.2", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": 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{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath6kl/cfg80211.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "225587bdbf4b0eb5265a71ee4dc183561a1857fc", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "d337213a889705a69735079606d0b4c672b17605", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "e11d5ae96d5e52cb48fa27c6ad352d766d0322fb", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "e3619bed5da125713b29ac881dc66f5e06606f88", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "e1330d719c047c4d8190a16be034b29fc601a815", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "8eb73016fb3968cf2db3987a92764563a3af773a", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}, {"lessThan": "3bbd05723d15dd06f0560bcd94fbf9a91b5f5613", "status": "affected", "version": "bdcd81707973cf8aa9305337166f8ee842a050d4", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath6kl/cfg80211.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.2"}, {"lessThan": "3.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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: ath6kl: clamp assoc request/response lengths before subtracting IE offsets\n\nath6kl_cfg80211_connect_event() subtracts fixed IE offsets from\nassoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower\nbound. The aggregate check recently added to ath6kl_wmi_connect_event_rx()\nbounds the declared lengths from above (their sum must fit the received\nevent), but an assoc request/response shorter than its fixed offset still\nunderflows here: the u8 wraps to ~250, and cfg80211_connect_result() /\ncfg80211_roamed() then treat that wrapped value as the IE length and copy\nthat many bytes out of the small assoc_info buffer to user space via\nnl80211, disclosing adjacent slab memory.\n\nClamp both lengths to their offsets before subtracting.\n\nFound by 0sec (https://0sec.ai) using automated source analysis; the\nmissing lower bound is evident from source. Compile-tested."}], "id": "CVE-2026-89524", "lastModified": "2026-10-19T09:17:46.873", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:19:35.137", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: ath6kl Wi-Fi driver information disclosure via integer underflow", "id": "2532320", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532320"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the ath6kl Wi-Fi driver of the Linux kernel. An integer underflow vulnerability occurs when processing Wi-Fi association requests or responses that are shorter than expected. This can cause the system to read beyond the intended buffer, leading to the disclosure of adjacent memory to a remote attacker. This information disclosure could potentially expose sensitive data."], "name": "CVE-2026-89524", "public_date": "2026-09-11T19:44:05Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89524\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89524\nhttps://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613\nhttps://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a\nhttps://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815\nhttps://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88"], "threat_severity": "Important"}

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