---
id: CVE-2026-68198
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: ath6kl: fix use-after-free in aggr_reset_state()

  The aggr_reset_state() function uses timer_delete() (non-synchronous)
  for the aggregation timer before proceedin…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: ath6kl: fix use-after-free in aggr_reset_state()

  The aggr_reset_state() function uses timer_delete() (non-synchronous)
  for the aggregation timer before proceedin…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2026-08-10'
updated: '2026-08-23'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68198'
references:
  - url: 'https://git.kernel.org/stable/c/17ff29cd8dbc977c97788a5f7c011ec807b58242'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/18965470d41e69d3fc10eb62afae29d10f4cdfd1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2132a6db05846dd2318857d00e0c1291f9e41b29'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/64af6534a085f49d6ed33338a19ab9cf0d0523c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a1bac650b2d6b1baab1f3e78e2e007a6e2948dde'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a3313111b5d9046af60b370c93eec105b27380c1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b5d618fd61b9069b4c0a6b487022dd3117ad5acc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ba7debb4dd6427386862220e8335a53a4bfc235d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.004
epssPercentile: 0.31569
ingestedAt: '2026-08-23T13:48:06.611Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

wifi: ath6kl: fix use-after-free in aggr_reset_state()

The aggr_reset_state() function uses timer_delete() (non-synchronous)
for the aggregation timer before proceeding to delete TID state and
before the structure is freed by callers like aggr_module_destroy().

If the timer callback (aggr_timeout) is executing when aggr_reset_state()
is called, the callback will continue to access aggr_conn fields like
rx_tid[] and stat[] which may be freed immediately after by
kfree(aggr_info->aggr_conn) in aggr_module_destroy().

Additionally, the timer callback can re-arm itself via mod_timer() while
aggr_reset_state() is running, creating a more complex race condition.

Use timer_delete_sync() instead to ensure any running timer callback
has completed before returning.

## Remediation

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