CVE-2026-90351 wifi: mt76: mt7996: do not attach hif2 WED when the main WED attach failed
A Linux kernel WiFi driver bug causes a crash when primary hardware initialization fails, leading to denial of service for local or adjacent attackers.
- 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-2026-90351?
CVE-2026-90351 is a 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: do not attach hif2 WED when the main WED attach failed
If the WED attach for the primary PCIe function fails, the probe path still attached wed_hif2 for the secondary function, leaving the device in an inconsistent half-WED configuration that crashes later. The hif2 call also re-enabled hwrro_mode, which the failed primary attach had just turned off.
Skip the hif2 WED setup when the primary WED device is not active.
Which versions are affected by CVE-2026-90351?
How do I fix CVE-2026-90351?
Apply the vendor's patch.
Is CVE-2026-90351 being exploited?
There is no known exploitation of CVE-2026-90351 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90351, DEBIAN-CVE-2026-90351, GHSA-v7hx-fgg2-wjqx, UBUNTU-CVE-2026-90351.