CVE-2026-63866 wifi: mt76: mt7996: Clear wcid pointer in mt7996_mac_sta_deinit_link()
A use-after-free vulnerability in the Linux kernel mt7996 WiFi driver allows attackers to potentially execute code or cause a system crash.
- 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-2026-63866?
CVE-2026-63866 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jul 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: mt76: mt7996: Clear wcid pointer in mt7996_mac_sta_deinit_link()
Clear WCID pointer removing the sta link in mt7996_mac_sta_deinit_link routine.
Which versions are affected by CVE-2026-63866?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63866?
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-2026-63866 being exploited?
There is no known exploitation of CVE-2026-63866 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63866, DEBIAN-CVE-2026-63866, GHSA-xhw4-f4c3-7c2f, UBUNTU-CVE-2026-63866.