{"id":"CVE-2026-89524","summary":"wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets","details":"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.","modified":"2026-09-13T03:47:19.070326369Z","published":"2026-09-11T19:44:05.548Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89524.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89524.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89524"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bdcd81707973cf8aa9305337166f8ee842a050d4"},{"fixed":"e3619bed5da125713b29ac881dc66f5e06606f88"},{"fixed":"e1330d719c047c4d8190a16be034b29fc601a815"},{"fixed":"8eb73016fb3968cf2db3987a92764563a3af773a"},{"fixed":"3bbd05723d15dd06f0560bcd94fbf9a91b5f5613"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89524.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.2.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89524.json"}}],"schema_version":"1.9.0"}