---
id: CVE-2026-89524
title: >-
  wifi: ath6kl: clamp assoc request/response lengths before subtracting IE
  offsets
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) a…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    225587bdbf4b0eb5265a71ee4dc183561a1857fc
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    d337213a889705a69735079606d0b4c672b17605
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    e11d5ae96d5e52cb48fa27c6ad352d766d0322fb
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    e3619bed5da125713b29ac881dc66f5e06606f88
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    e1330d719c047c4d8190a16be034b29fc601a815
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    8eb73016fb3968cf2db3987a92764563a3af773a
  - >-
    Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 <
    3bbd05723d15dd06f0560bcd94fbf9a91b5f5613
  - Linux 3.2
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:48:15.538Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89524'
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'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89524.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89524'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532320'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89524'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89524'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89524.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00274
epssPercentile: 0.19658
scores:
  cna: 8.1
  vendor: 5.5
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

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.

## Affected

- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < 225587bdbf4b0eb5265a71ee4dc183561a1857fc`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < d337213a889705a69735079606d0b4c672b17605`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < e11d5ae96d5e52cb48fa27c6ad352d766d0322fb`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < 6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < e3619bed5da125713b29ac881dc66f5e06606f88`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < e1330d719c047c4d8190a16be034b29fc601a815`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < 8eb73016fb3968cf2db3987a92764563a3af773a`
- `Linux >= bdcd81707973cf8aa9305337166f8ee842a050d4 < 3bbd05723d15dd06f0560bcd94fbf9a91b5f5613`
- `Linux 3.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89524.json)