{ "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": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc" }, { "url": "https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605" }, { "url": "https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb" }, { "url": "https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9" }, { "url": "https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88" }, { "url": "https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815" }, { "url": "https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a" }, { "url": "https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613" } ], "title": "wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets", 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