The system could be made to crash under certain conditions.
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.
21 June 2015
A security issue affects these releases of Ubuntu and its derivatives:
The system could be made to crash under certain conditions.
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.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the necessary changes.
Vulmon