CVE-2014-8989

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.

Bugs

• <https://launchpad.net/bugs/1395189&gt;

Notes