Linux kernel (Utopic HWE) regression

2015-06-21T00:00:00
ID USN-2644-2
Type ubuntu
Reporter Ubuntu
Modified 2015-06-21T00:00:00

Description

The Fix for CVE-2015-1328 introduced a regression into the Linux kernel's
overlayfs file system. The removal of a directory that only exists on the
lower layer results in a kernel panic.

We apologize for the inconvenience.

Original advisory details:

Philip Pettersson discovered a privilege escalation when using overlayfs
mounts inside of user namespaces. A local user could exploit this flaw to
gain administrative privileges on the system.