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==========================================================================Ubuntu Security Notice USN-2911-1
February 22, 2016

linux vulnerability
==========================================================================
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:

It was discovered that the Linux kernel keyring subsystem contained a race
between read and revoke operations. A local attacker could use this to
cause a denial of service (system crash).

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-99-generic    3.2.0-99.139
  linux-image-3.2.0-99-generic-pae  3.2.0-99.139
  linux-image-3.2.0-99-highbank   3.2.0-99.139
  linux-image-3.2.0-99-omap       3.2.0-99.139
  linux-image-3.2.0-99-powerpc-smp  3.2.0-99.139
  linux-image-3.2.0-99-powerpc64-smp  3.2.0-99.139
  linux-image-3.2.0-99-virtual    3.2.0-99.139

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-2911-1
  CVE-2015-7550

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-99.139