CVE-2026-90367 wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
A race condition in the mt7996 WiFi driver can corrupt DMA descriptors during reset, potentially causing system instability or denial of service.
- 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-2026-90367?
CVE-2026-90367 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: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
mt7996_mac_reset_work() parked the tx worker and disabled the RX/TX NAPIs before taking dev->mt76.mutex. mt76_worker_disable()/_enable() are plain kthread park/unpark, not refcounted, and __mt76_set_channel() toggles the same worker and the MT76_RESET bit under the mutex. An L1 SER racing a channel switch could therefore have the worker unparked and MT76_RESET cleared while the reset path resets the DMA rings, corrupting descriptors or tokens. Take the mutex before disabling the worker, as mt7915 does.
Which versions are affected by CVE-2026-90367?
How do I fix CVE-2026-90367?
Apply the vendor's patch.
Is CVE-2026-90367 being exploited?
There is no known exploitation of CVE-2026-90367 in the wild and no public exploit code.
Sources
Also known as AZL-102164, BELL-CVE-2026-90367, DEBIAN-CVE-2026-90367, GHSA-rjqr-mg4v-422g, UBUNTU-CVE-2026-90367.