# CVE-2022-3521: Linux Kernel kcm kcmsock.c kcm_tx_work race condition

> A race condition in the Linux Kernel kcm module can lead to denial of service, requiring a patch for mitigation.

- **Severity:** Low 2.6 (`CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L`)
- **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:** 16 Oct 2022
- **Updated:** 14 Oct 2026
- **Also known as:** AZL-11131, DEBIAN-CVE-2022-3521, GHSA-76r5-xvfg-3gj2, UBUNTU-CVE-2022-3521

## What is CVE-2022-3521?

CVE-2022-3521 is a low-severity vulnerability in Debian Debian Linux, published on 16 Oct 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability has been found in Linux Kernel and classified as problematic. This vulnerability affects the function kcm_tx_work of the file net/kcm/kcmsock.c of the component kcm. The manipulation leads to race condition. It is recommended to apply a patch to fix this issue. VDB-211018 is the identifier assigned to this vulnerability.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2022-3521?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2022-3521?

Apply the vendor's patch.

## Is CVE-2022-3521 being exploited?

There is no known exploitation of CVE-2022-3521 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
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- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-3521 and fix it if it is affected.

What it is: CVE-2022-3521 is a low-severity vulnerability in Debian Debian Linux, published on 16 Oct 2022. 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-2022-3521 in the wild and no public exploit code.

Affected product: Debian Debian 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-2022-3521/ (Markdown: https://insights.sbomify.com/CVE-2022-3521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3521
- OSV: https://osv.dev/vulnerability/CVE-2022-3521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3521/
Summaries are generated and may contain mistakes; the official description above is the record.