High severity · published Sep 11, 2026
CVE-2026-89524
wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets
8.1
CVSS
0.3%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets ath6kl_cfg80211_connect_event() subtracts fixed IE offsets from assoc_req_len (-= 4) and assoc_resp_len (-= 6), both u8, with no lower bound. The aggregate check recently added to ath6kl_wmi_connect_event_rx() bounds the declared lengths from above (their sum must fit the received event), but an assoc request/response shorter than its fixed offset still underflows here: the u8 wraps to ~250, and cfg80211_connect_result() / cfg80211_roamed() then treat that wrapped value as the IE length and copy that many bytes out of the small assoc_info buffer to user space via nl80211, disclosing adjacent slab memory. Clamp both lengths to their offsets before subtracting. Found by 0sec (https://0sec.ai) using automated source analysis; the missing lower bound is evident from source. Compile-tested.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
bdcd81707973cf8aa9305337166f8ee842a050d4 before 225587bdbf4b0eb5265a71ee4dc183561a1857fc; bdcd81707973cf8aa9305337166f8ee842a050d4 before d337213a889705a69735079606d0b4c672b17605; bdcd81707973cf8aa9305337166f8ee842a050d4 before e11d5ae96d5e52cb48fa27c6ad352d766d0322fb; bdcd81707973cf8aa9305337166f8ee842a050d4 before 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9; bdcd81707973cf8aa9305337166f8ee842a050d4 before e3619bed5da125713b29ac881dc66f5e06606f88; bdcd81707973cf8aa9305337166f8ee842a050d4 before e1330d719c047c4d8190a16be034b29fc601a815; +3 more · source: vendor