# CVE-2022-3646: Linux Kernel BPF segment.c nilfs_attach_log_writer memory leak

> A memory leak in the Linux Kernel nilfs2 filesystem allows remote attackers to cause a denial of service.

- **Severity:** Low 3.1 (`CVSS:3.1/AV:N/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:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Oct 2022
- **Updated:** 14 Oct 2026
- **Also known as:** DEBIAN-CVE-2022-3646, GHSA-h2j4-qp68-f436, UBUNTU-CVE-2022-3646

## What is CVE-2022-3646?

CVE-2022-3646 is a low-severity denial of service vulnerability in Debian Debian Linux, published on 21 Oct 2022. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability, which was classified as problematic, has been found in Linux Kernel. This issue affects the function nilfs_attach_log_writer of the file fs/nilfs2/segment.c of the component BPF. The manipulation leads to memory leak. The attack may be initiated remotely. It is recommended to apply a patch to fix this issue. The identifier VDB-211961 was assigned to this vulnerability.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime), CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2022-3646?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2022-3646?

Apply the vendor's patch.

## Is CVE-2022-3646 being exploited?

There is no known exploitation of CVE-2022-3646 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)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [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-2022-3646 and fix it if it is affected.

What it is: CVE-2022-3646 is a low-severity denial of service vulnerability in Debian Debian Linux, published on 21 Oct 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-3646 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-2022-3646/ (Markdown: https://insights.sbomify.com/CVE-2022-3646/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-3646
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-3646
- OSV: https://osv.dev/vulnerability/CVE-2022-3646

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-3646/
Summaries are generated and may contain mistakes; the official description above is the record.