CVE-2026-68199 wifi: ath6kl: fix OOB access from firmware ADDBA window size
A missing validation in the ath6kl Wi-Fi driver allows out-of-bounds memory access via crafted firmware ADDBA window sizes, potentially leading to code execution or crashes.
- 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-2026-68199?
CVE-2026-68199 is a high-severity memory corruption 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 OOB access from firmware ADDBA window size
aggr_recv_addba_req_evt() logs a debug message when the firmware-supplied win_sz is outside [AGGR_WIN_SZ_MIN, AGGR_WIN_SZ_MAX] but does not return. The out-of-range win_sz is then used in TID_WINDOW_SZ() to compute a kzalloc size and stored in rxtid->hold_q_sz, leading to zero-size or overflowed allocations and subsequent out-of-bounds access.
Clean up any previously active aggregation session for the TID first, then return early when win_sz is out of the valid range, instead of proceeding with a broken allocation size.
Weakness: CWE-20
Which versions are affected by CVE-2026-68199?
How do I fix CVE-2026-68199?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-68199 being exploited?
There is no known exploitation of CVE-2026-68199 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-68199, DEBIAN-CVE-2026-68199, GHSA-78gm-4hww-qgr6, UBUNTU-CVE-2026-68199.