[USN-3218-1] Linux kernel vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3218-1
March 07, 2017

linux, linux-ti-omap4 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: Linux kernel
- linux-ti-omap4: Linux kernel for OMAP4

Details:

Alexander Popov discovered that the N_HDLC line discipline implementation
in the Linux kernel contained a double-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
administrative privileges.

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-124-generic   3.2.0-124.167
  linux-image-3.2.0-124-generic-pae  3.2.0-124.167
  linux-image-3.2.0-124-highbank  3.2.0-124.167
  linux-image-3.2.0-124-omap      3.2.0-124.167
  linux-image-3.2.0-124-powerpc-smp  3.2.0-124.167
  linux-image-3.2.0-124-powerpc64-smp  3.2.0-124.167
  linux-image-3.2.0-124-virtual   3.2.0-124.167
  linux-image-3.2.0-1502-omap4    3.2.0-1502.129
  linux-image-generic             3.2.0.124.139
  linux-image-generic-pae         3.2.0.124.139
  linux-image-highbank            3.2.0.124.139
  linux-image-omap                3.2.0.124.139
  linux-image-omap4               3.2.0.1502.97
  linux-image-powerpc-smp         3.2.0.124.139
  linux-image-powerpc64-smp       3.2.0.124.139
  linux-image-virtual             3.2.0.124.139

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-3218-1
  CVE-2017-2636

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-124.167
  https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1502.129

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