# CVE-2026-90351: wifi: mt76: mt7996: do not attach hif2 WED when the main WED attach failed

> A Linux kernel WiFi driver bug causes a crash when primary hardware initialization fails, leading to denial of service for local or adjacent attackers.

- **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:** 21 Oct 2026
- **Also known as:** BELL-CVE-2026-90351, DEBIAN-CVE-2026-90351, GHSA-v7hx-fgg2-wjqx, UBUNTU-CVE-2026-90351

## What is CVE-2026-90351?

CVE-2026-90351 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: do not attach hif2 WED when the main WED attach failed

If the WED attach for the primary PCIe function fails, the probe path
still attached wed_hif2 for the secondary function, leaving the device
in an inconsistent half-WED configuration that crashes later. The hif2
call also re-enabled hwrro_mode, which the failed primary attach had
just turned off.

Skip the hif2 WED setup when the primary WED device is not active.

## Which versions are affected by CVE-2026-90351?


## How do I fix CVE-2026-90351?

Apply the vendor's patch.

## Is CVE-2026-90351 being exploited?

There is no known exploitation of CVE-2026-90351 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90351 and fix it if it is affected.

What it is: CVE-2026-90351 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.
Exploitation: There is no known exploitation of CVE-2026-90351 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-2026-90351/ (Markdown: https://insights.sbomify.com/CVE-2026-90351/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90351
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90351
- OSV: https://osv.dev/vulnerability/CVE-2026-90351

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90351/
Summaries are generated and may contain mistakes; the official description above is the record.