[USN-2640-2] Linux kernel regression

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==========================================================================
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:
http://www.ubuntu.com/usn/usn-2640-2
http://www.ubuntu.com/usn/usn-2640-1
http://bugs.launchpad.net/bugs/1465998

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