CVE-2026-68198 wifi: ath6kl: fix use-after-free in aggr_reset_state()
A use-after-free vulnerability in the Linux kernel's ath6kl Wi-Fi driver allows attackers to potentially execute code or escalate privileges via a race condition.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68198?
CVE-2026-68198 is a high-severity use after free vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-416
Which versions are affected by CVE-2026-68198?
How do I fix CVE-2026-68198?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-68198 being exploited?
There is no known exploitation of CVE-2026-68198 in the wild and no public exploit code.
Sources
Also known as AZL-94998, BELL-CVE-2026-68198, DEBIAN-CVE-2026-68198, GHSA-mrq7-mrhj-vm2g, UBUNTU-CVE-2026-68198.