# CVE-2024-40977: wifi: mt76: mt7921s: fix potential hung tasks during chip recovery

> A deadlock in the mt7921s Wi-Fi driver during chip recovery can cause hung tasks and potential device reboots, requiring a kernel patch.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Jul 2024
- **Updated:** 11 May 2026
- **Also known as:** AZL-48942, BELL-CVE-2024-40977, DEBIAN-CVE-2024-40977, GHSA-r7xw-j6rq-f93p, ROOT-OS-DEBIAN-11-CVE-2024-40977, ROOT-OS-UBUNTU-2204-CVE-2024-40977, UBUNTU-CVE-2024-40977

## What is CVE-2024-40977?

CVE-2024-40977 is a medium-severity vulnerability in Linux kernel, published on 12 Jul 2024. 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: mt7921s: fix potential hung tasks during chip recovery

During chip recovery (e.g. chip reset), there is a possible situation that
kernel worker reset_work is holding the lock and waiting for kernel thread
stat_worker to be parked, while stat_worker is waiting for the release of
the same lock.
It causes a deadlock resulting in the dumping of hung tasks messages and
possible rebooting of the device.

This patch prevents the execution of stat_worker during the chip recovery.

Weakness: CWE-667 (Improper Locking)

## Which versions are affected by CVE-2024-40977?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-40977?

Apply the vendor's patch.

## Is CVE-2024-40977 being exploited?

There is no known exploitation of CVE-2024-40977 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-40977 and fix it if it is affected.

What it is: CVE-2024-40977 is a medium-severity vulnerability in Linux kernel, published on 12 Jul 2024. 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-2024-40977 in the wild and no public exploit code.

Affected product: Linux kernel. 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-2024-40977/ (Markdown: https://insights.sbomify.com/CVE-2024-40977/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-40977
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-40977
- OSV: https://osv.dev/vulnerability/CVE-2024-40977

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-40977/
Summaries are generated and may contain mistakes; the official description above is the record.