# CVE-2024-27021: r8169: fix LED-related deadlock on module removal

> A deadlock in the r8169 network driver during module removal can cause a denial of service in the Linux kernel.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 1 May 2024
- **Updated:** 11 May 2026
- **Also known as:** BELL-CVE-2024-27021, DEBIAN-CVE-2024-27021, GHSA-684m-v6v9-3h53, UBUNTU-CVE-2024-27021

## What is CVE-2024-27021?

CVE-2024-27021 is a high-severity vulnerability in Fedoraproject Fedora, published on 1 May 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:

r8169: fix LED-related deadlock on module removal

Binding devm_led_classdev_register() to the netdev is problematic
because on module removal we get a RTNL-related deadlock. Fix this
by avoiding the device-managed LED functions.

Note: We can safely call led_classdev_unregister() for a LED even
if registering it failed, because led_classdev_unregister() detects
this and is a no-op in this case.

Weakness: CWE-667 (Improper Locking)

## Which versions are affected by CVE-2024-27021?

It affects 2 products.


Products: Fedoraproject Fedora, Linux kernel.

## How do I fix CVE-2024-27021?

Apply the vendor's patch.

## Is CVE-2024-27021 being exploited?

There is no known exploitation of CVE-2024-27021 in the wild and no public exploit code.

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- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-27021 and fix it if it is affected.

What it is: CVE-2024-27021 is a high-severity vulnerability in Fedoraproject Fedora, published on 1 May 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-2024-27021 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. 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-2024-27021/ (Markdown: https://insights.sbomify.com/CVE-2024-27021/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27021
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27021
- OSV: https://osv.dev/vulnerability/CVE-2024-27021

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-27021/
Summaries are generated and may contain mistakes; the official description above is the record.