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CVE-2026-89524

wifi: ath6kl: clamp assoc request/response lengths before subtracting IE offsets

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in 225587bdbf4b0eb5265a71ee4dc183561a1857fc; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in d337213a889705a69735079606d0b4c672b17605; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in e11d5ae96d5e52cb48fa27c6ad352d766d0322fb; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in e3619bed5da125713b29ac881dc66f5e06606f88; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in e1330d719c047c4d8190a16be034b29fc601a815; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in 8eb73016fb3968cf2db3987a92764563a3af773a; From bdcd81707973cf8aa9305337166f8ee842a050d4 · fixed in 3bbd05723d15dd06f0560bcd94fbf9a91b5f5613

  • Linux Linux

    3.2

  • KernelLinux

    From 3.2.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 8

git.kernel.org