# CVE-2024-44940: fou: remove warn in gue_gro_receive on unsupported protocol

> An attacker can trigger a kernel warning by sending crafted GUE packets, potentially causing system instability or log flooding.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Aug 2024
- **Updated:** 5 Aug 2026
- **Also known as:** AZL-49140, BELL-CVE-2024-44940, DEBIAN-CVE-2024-44940, GHSA-3mqr-vvf3-23jj, UBUNTU-CVE-2024-44940

## What is CVE-2024-44940?

CVE-2024-44940 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 26 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

fou: remove warn in gue_gro_receive on unsupported protocol

Drop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is
not known or does not have a GRO handler.

Such a packet is easily constructed. Syzbot generates them and sets
off this warning.

Remove the warning as it is expected and not actionable.

The warning was previously reduced from WARN_ON to WARN_ON_ONCE in
commit 270136613bf7 ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad
proto callbacks").

## Which versions are affected by CVE-2024-44940?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2024-44940?

Apply the vendor's patch.

## Is CVE-2024-44940 being exploited?

There is no known exploitation of CVE-2024-44940 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-2024-44940 and fix it if it is affected.

What it is: CVE-2024-44940 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 26 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-44940 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-2024-44940/ (Markdown: https://insights.sbomify.com/CVE-2024-44940/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-44940
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-44940
- OSV: https://osv.dev/vulnerability/CVE-2024-44940

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-44940/
Summaries are generated and may contain mistakes; the official description above is the record.