=========================================================================Ubuntu Security Notice USN-2640-2
June 21, 2015

linux regression
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

The system could be made to crash under certain conditions.

Software Description:
- linux: Linux kernel

Details:

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.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 LTS:
  linux-image-3.2.0-86-generic    3.2.0-86.124
  linux-image-3.2.0-86-generic-pae  3.2.0-86.124
  linux-image-3.2.0-86-highbank   3.2.0-86.124
  linux-image-3.2.0-86-omap       3.2.0-86.124
  linux-image-3.2.0-86-powerpc-smp  3.2.0-86.124
  linux-image-3.2.0-86-powerpc64-smp  3.2.0-86.124
  linux-image-3.2.0-86-virtual    3.2.0-86.124

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-2640-2
  https://ubuntu.com/security/notices/USN-2640-1
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465998

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-86.124