# CVE-2025-38151: RDMA/cma: Fix hang when cma_netevent_callback fails to queue_work

> A flaw in the Linux kernel RDMA subsystem causes a hang and zombie processes when work queueing fails, requiring a patch to restore stability.

- **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:** 3 Jul 2025
- **Updated:** 23 May 2026
- **Also known as:** BELL-CVE-2025-38151, DEBIAN-CVE-2025-38151, GHSA-cf9r-5584-2473, ROOT-OS-DEBIAN-12-CVE-2025-38151, UBUNTU-CVE-2025-38151

## What is CVE-2025-38151?

CVE-2025-38151 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 3 Jul 2025. 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:

RDMA/cma: Fix hang when cma_netevent_callback fails to queue_work

The cited commit fixed a crash when cma_netevent_callback was called for
a cma_id while work on that id from a previous call had not yet started.
The work item was re-initialized in the second call, which corrupted the
work item currently in the work queue.

However, it left a problem when queue_work fails (because the item is
still pending in the work queue from a previous call). In this case,
cma_id_put (which is called in the work handler) is therefore not
called. This results in a userspace process hang (zombie process).

Fix this by calling cma_id_put() if queue_work fails.

## Which versions are affected by CVE-2025-38151?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2025-38151?

Apply the vendor's patch.

## Is CVE-2025-38151 being exploited?

There is no known exploitation of CVE-2025-38151 in the wild and no public exploit code.

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## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-38151 and fix it if it is affected.

What it is: CVE-2025-38151 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 3 Jul 2025. 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-2025-38151 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-2025-38151/ (Markdown: https://insights.sbomify.com/CVE-2025-38151/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-38151
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-38151
- OSV: https://osv.dev/vulnerability/CVE-2025-38151

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-38151/
Summaries are generated and may contain mistakes; the official description above is the record.