[USN-2870-2] Linux kernel (Trusty HWE) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-2870-2
January 19, 2016

linux-lts-trusty vulnerability
==========================================================================

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

- Ubuntu 12.04 LTS

Summary:

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

Software Description:
- linux-lts-trusty: Linux hardware enablement kernel from Trusty

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 12.04 LTS:
  linux-image-3.13.0-76-generic   3.13.0-76.120~precise1
  linux-image-3.13.0-76-generic-lpae  3.13.0-76.120~precise1

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-2870-2
  http://www.ubuntu.com/usn/usn-2870-1
  CVE-2016-0728

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-76.120~precise1

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