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==========================================================================
Ubuntu Security Notice USN-2871-2
January 19, 2016

linux-lts-vivid vulnerability
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

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

Software Description:
- linux-lts-vivid: Linux hardware enablement kernel from Vivid

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 14.04 LTS:
  linux-image-3.19.0-47-generic   3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-generic-lpae  3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-lowlatency  3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-powerpc-e500mc  3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-powerpc-smp  3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-powerpc64-emb  3.19.0-47.53~14.04.1
  linux-image-3.19.0-47-powerpc64-smp  3.19.0-47.53~14.04.1

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:
  http://www.ubuntu.com/usn/usn-2871-2
  http://www.ubuntu.com/usn/usn-2871-1
  CVE-2016-0728

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-47.53~14.04.1


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