CVE-2026-90382 wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length
A remote attacker can crash the Linux kernel by sending corrupted WiFi frames to a device in monitor mode with specific filters enabled.
- 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-2026-90382?
CVE-2026-90382 is a denial of service 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: mt76x02: do not WARN on invalid rx descriptor length
The MPDU length in the rx descriptor comes from the hardware. In monitor mode with the fcsfail filter enabled, the hardware passes up corrupted frames, and a corrupted frame can report a length larger than the received buffer. The bounds check correctly discards such frames, but its WARN_ON_ONCE wrapper means any over-the-air garbage frame taints the kernel, and panics it on the first such frame when panic_on_warn is set.
Drop the WARN and discard the frame silently, matching what commit c2d4c8723dbf ("mt76x2: remove some harmless WARN_ONs in tx status and rx path") did for the neighboring rx and tx status paths.
Observed immediately on rx with an MT7612U in fcsfail monitor mode on a busy channel.
Which versions are affected by CVE-2026-90382?
How do I fix CVE-2026-90382?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-90382 being exploited?
There is no known exploitation of CVE-2026-90382 in the wild and no public exploit code.
Sources
Also known as AZL-102384, BELL-CVE-2026-90382, DEBIAN-CVE-2026-90382, GHSA-m9jv-gchx-48gv, UBUNTU-CVE-2026-90382.