# CVE-2026-89524

## Summary

- **CVE ID:** CVE-2026-89524
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- Linux — Linux (bdcd81707973cf8aa9305337166f8ee842a050d4)
- Linux — Linux (3.2)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/e3619bed5da125713b29ac881dc66f5e06606f88)
- [CNA](https://git.kernel.org/stable/c/e1330d719c047c4d8190a16be034b29fc601a815)
- [CNA](https://git.kernel.org/stable/c/8eb73016fb3968cf2db3987a92764563a3af773a)
- [CNA](https://git.kernel.org/stable/c/3bbd05723d15dd06f0560bcd94fbf9a91b5f5613)
- [CNA](https://git.kernel.org/stable/c/225587bdbf4b0eb5265a71ee4dc183561a1857fc)
- [CNA](https://git.kernel.org/stable/c/d337213a889705a69735079606d0b4c672b17605)
- [CNA](https://git.kernel.org/stable/c/e11d5ae96d5e52cb48fa27c6ad352d766d0322fb)
- [CNA](https://git.kernel.org/stable/c/6deb4d7a0c3d91821b2a8d5239e3d9933d9217d9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._