=========================================================================Ubuntu Security Notice USN-2871-1
January 19, 2016

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

- Ubuntu 15.04

Summary:

The system could be made to crash or run programs as an administrator.

Software Description:
- linux: Linux kernel

Details:

Yevgeny Pats discovered that the session keyring implementation in the
Linux kernel did not properly reference count when joining an existing
session keyring. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code with
administrative privileges.

Update instructions:

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

Ubuntu 15.04:
  linux-image-3.19.0-47-generic   3.19.0-47.53
  linux-image-3.19.0-47-generic-lpae  3.19.0-47.53
  linux-image-3.19.0-47-lowlatency  3.19.0-47.53
  linux-image-3.19.0-47-powerpc-e500mc  3.19.0-47.53
  linux-image-3.19.0-47-powerpc-smp  3.19.0-47.53
  linux-image-3.19.0-47-powerpc64-emb  3.19.0-47.53
  linux-image-3.19.0-47-powerpc64-smp  3.19.0-47.53

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://ubuntu.com/security/notices/USN-2871-1
  CVE-2016-0728

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.19.0-47.53