CVE-2026-90381 wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
A logic error in the mt76 WiFi driver causes improper handling of channel context switches, potentially leading to system instability 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-2026-90381?
CVE-2026-90381 is a high-severity vulnerability in Linux, published on 17 Sep 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: fix handling channel context with different bands in mt76_switch_vif_chanctx()
When performing channel switches on different radios within a short timeframe, channel contexts with different bands can be carried for each struct ieee80211_vif_chanctx_switch.
Rework mt76_switch_vif_chanctx() to properly handle this scenario.
Which versions are affected by CVE-2026-90381?
How do I fix CVE-2026-90381?
Apply the vendor's patch.
Is CVE-2026-90381 being exploited?
There is no known exploitation of CVE-2026-90381 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90381, DEBIAN-CVE-2026-90381, GHSA-2vfx-fvfp-v5mv, UBUNTU-CVE-2026-90381.