# CVE-2024-27401: firewire: nosy: ensure user_length is taken into account when fetching packet contents

> A buffer overflow in the Linux kernel firewire nosy driver allows local attackers to cause memory corruption, potentially leading to code execution or privilege escalation.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 13 May 2024
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2024-27401, DEBIAN-CVE-2024-27401, GHSA-wmmp-mchh-75gf, UBUNTU-CVE-2024-27401

## What is CVE-2024-27401?

CVE-2024-27401 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 13 May 2024. 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:

firewire: nosy: ensure user_length is taken into account when fetching packet contents

Ensure that packet_buffer_get respects the user_length provided. If
the length of the head packet exceeds the user_length, packet_buffer_get
will now return 0 to signify to the user that no data were read
and a larger buffer size is required. Helps prevent user space overflows.

## Which versions are affected by CVE-2024-27401?

It affects 3 products.


Products: Debian Debian Linux, Fedoraproject Fedora, Linux kernel.

## How do I fix CVE-2024-27401?

Apply the vendor's patch.

## Is CVE-2024-27401 being exploited?

There is no known exploitation of CVE-2024-27401 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-2024-27401 and fix it if it is affected.

What it is: CVE-2024-27401 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 13 May 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-2024-27401 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-2024-27401/ (Markdown: https://insights.sbomify.com/CVE-2024-27401/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27401
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27401
- OSV: https://osv.dev/vulnerability/CVE-2024-27401

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-27401/
Summaries are generated and may contain mistakes; the official description above is the record.