# 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.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-102384, BELL-CVE-2026-90382, DEBIAN-CVE-2026-90382, GHSA-m9jv-gchx-48gv, UBUNTU-CVE-2026-90382

## 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.

## Is CVE-2026-90382 being exploited?

There is no known exploitation of CVE-2026-90382 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90382 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-90382 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-90382/ (Markdown: https://insights.sbomify.com/CVE-2026-90382/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90382
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90382
- OSV: https://osv.dev/vulnerability/CVE-2026-90382

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90382/
Summaries are generated and may contain mistakes; the official description above is the record.