CVE-2014-8989: Linux Kernel

Medium severity, CVSS 4.6. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: up to and including 3.17.3; version 3.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.3 only; version 3.0.4 only; …

Published 2014-11-30. Last modified 2026-06-17.