# CVE-2024-0639: Kernel: potential deadlock on &net->sctp.addr_wq_lock leading to dos

> Local users can trigger a deadlock in the Linux kernel SCTP subsystem, causing a system crash and denial of service.

- **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:** 17 Jan 2024
- **Updated:** 21 Jul 2026
- **Also known as:** AZL-33889, BELL-CVE-2024-0639, DEBIAN-CVE-2024-0639, GHSA-668p-x3m7-8w6v, UBUNTU-CVE-2024-0639

## What is CVE-2024-0639?

CVE-2024-0639 is a medium-severity denial of service vulnerability in Linux kernel, published on 17 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A denial of service vulnerability due to a deadlock was found in sctp_auto_asconf_init in net/sctp/socket.c in the Linux kernel’s SCTP subsystem. This flaw allows guests with local user privileges to trigger a deadlock and potentially crash the system.

Weakness: CWE-667 (Improper Locking), CWE-833 (Deadlock)

## Which versions are affected by CVE-2024-0639?

It affects 2 products.


Products: Linux kernel, Redhat Enterprise Linux.

## How do I fix CVE-2024-0639?

Apply the vendor's patch.

## Is CVE-2024-0639 being exploited?

There is no known exploitation of CVE-2024-0639 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-2024-0639 and fix it if it is affected.

What it is: CVE-2024-0639 is a medium-severity denial of service vulnerability in Linux kernel, published on 17 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-2024-0639 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-2024-0639/ (Markdown: https://insights.sbomify.com/CVE-2024-0639/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-0639
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-0639
- OSV: https://osv.dev/vulnerability/CVE-2024-0639

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-0639/
Summaries are generated and may contain mistakes; the official description above is the record.