# CVE-2024-0443: Kernel: blkio memory leakage due to blkcg and some blkgs are not freed after they are made offline.

> A local attacker can trigger a memory leak in the Linux kernel's block cgroup subsystem, causing system instability or out-of-memory errors.

- **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:** 11 Jan 2024
- **Updated:** 26 Oct 2026
- **Also known as:** DEBIAN-CVE-2024-0443, GHSA-rqh4-x2v7-j34g, UBUNTU-CVE-2024-0443

## What is CVE-2024-0443?

CVE-2024-0443 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A flaw was found in the blkgs destruction path in block/blk-cgroup.c in the Linux kernel, leading to a cgroup blkio memory leakage problem. When a cgroup is being destroyed, cgroup_rstat_flush() is only called at css_release_work_fn(), which is called when the blkcg reference count reaches 0. This circular dependency will prevent blkcg and some blkgs from being freed after they are made offline. This issue may allow an attacker with a local access to cause system instability, such as an out of memory error.

Weakness: CWE-668 (Exposure of Resource to Wrong Sphere), CWE-402 (Transmission of Private Resources into a New Sphere)

## Which versions are affected by CVE-2024-0443?

It affects 3 products.


Products: Fedoraproject Fedora, Linux kernel, Redhat Enterprise Linux.

## How do I fix CVE-2024-0443?

Apply the vendor's patch.

## Is CVE-2024-0443 being exploited?

There is no known exploitation of CVE-2024-0443 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [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-2024-0443 and fix it if it is affected.

What it is: CVE-2024-0443 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 11 Jan 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-2024-0443 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-2024-0443/ (Markdown: https://insights.sbomify.com/CVE-2024-0443/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-0443
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-0443
- OSV: https://osv.dev/vulnerability/CVE-2024-0443

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-0443/
Summaries are generated and may contain mistakes; the official description above is the record.