CVE-2026-90374 wifi: mt76: mt7996: validate RX band_idx before dereferencing phys[]
A missing bounds check in the mt7996 WiFi driver allows a nearby attacker to cause a kernel crash via malformed packets.
- 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-2026-90374?
CVE-2026-90374 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: validate RX band_idx before dereferencing phys[]
band_idx comes from a 2-bit descriptor field (0-3) and was used directly to index dev->mt76.phys[] (size __MT_MAX_BAND == 3) and dereference the result. A corrupt or reserved descriptor value could index out of bounds or hit a NULL phy on parts with fewer bands. Reject invalid band indices, mirroring mt7996_rx_get_wcid().
Which versions are affected by CVE-2026-90374?
How do I fix CVE-2026-90374?
Apply the vendor's patch.
Is CVE-2026-90374 being exploited?
There is no known exploitation of CVE-2026-90374 in the wild and no public exploit code.
Sources
Also known as AZL-102785, BELL-CVE-2026-90374, DEBIAN-CVE-2026-90374, GHSA-xvmg-v5vr-xr53, UBUNTU-CVE-2026-90374.