# CVE-2026-90381: wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()

> A logic error in the mt76 WiFi driver causes improper handling of channel context switches, potentially leading to system instability or crashes.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **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:** BELL-CVE-2026-90381, DEBIAN-CVE-2026-90381, GHSA-2vfx-fvfp-v5mv, UBUNTU-CVE-2026-90381

## What is CVE-2026-90381?

CVE-2026-90381 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: fix handling channel context with different bands in mt76_switch_vif_chanctx()

When performing channel switches on different radios within a short
timeframe, channel contexts with different bands can be carried for
each struct ieee80211_vif_chanctx_switch.

Rework mt76_switch_vif_chanctx() to properly handle this scenario.

## Which versions are affected by CVE-2026-90381?


## How do I fix CVE-2026-90381?

Apply the vendor's patch.

## Is CVE-2026-90381 being exploited?

There is no known exploitation of CVE-2026-90381 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90381 and fix it if it is affected.

What it is: CVE-2026-90381 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.
Exploitation: There is no known exploitation of CVE-2026-90381 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-2026-90381/ (Markdown: https://insights.sbomify.com/CVE-2026-90381/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90381
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90381
- OSV: https://osv.dev/vulnerability/CVE-2026-90381

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90381/
Summaries are generated and may contain mistakes; the official description above is the record.