CVE-2026-80635 wifi: wcn36xx: fix OOB read from short trigger BA firmware response
An out-of-bounds read in the wcn36xx WiFi driver allows attackers to read stale heap data and corrupt session state via crafted firmware responses.
- 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-2026-80635?
CVE-2026-80635 is a high-severity vulnerability in Linux, published on 28 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: wcn36xx: fix OOB read from short trigger BA firmware response
The firmware response length is only checked against sizeof(*rsp) (20 bytes), but when candidate_cnt >= 1, a 22-byte candidate struct is read at buf + 20 without verifying the response contains it. This causes an out-of-bounds read of stale heap data, corrupting the BA session state.
Add validation that the response includes the candidate data.
Which versions are affected by CVE-2026-80635?
How do I fix CVE-2026-80635?
Apply the vendor's patch.
Is CVE-2026-80635 being exploited?
There is no known exploitation of CVE-2026-80635 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80635, DEBIAN-CVE-2026-80635, GHSA-5gcp-mjqf-m8mf, UBUNTU-CVE-2026-80635.