CVE-2026-90372 wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss
An integer underflow in the mt7915 WiFi driver can cause invalid beamforming data to be sent to firmware, potentially leading to 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-2026-90372?
CVE-2026-90372 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: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss
If a peer's VHT/HE MCS map has no supported spatial stream (all fields 0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255), which was then written into the firmware sta_rec_bf beamforming fields. Clamp the result to 0.
Which versions are affected by CVE-2026-90372?
How do I fix CVE-2026-90372?
Apply the vendor's patch.
Is CVE-2026-90372 being exploited?
There is no known exploitation of CVE-2026-90372 in the wild and no public exploit code.
Sources
Also known as AZL-102381, BELL-CVE-2026-90372, DEBIAN-CVE-2026-90372, GHSA-934p-6j28-7ggx, UBUNTU-CVE-2026-90372.