[USN-3220-1] Linux kernel vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3220-1
March 08, 2017

linux, linux-gke, linux-raspi2, linux-snapdragon vulnerability
==========================================================================

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

- Ubuntu 16.04 LTS

Summary:

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

Software Description:
- linux: Linux kernel
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon Processors

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 16.04 LTS:
  linux-image-4.4.0-1005-gke      4.4.0-1005.6
  linux-image-4.4.0-1046-raspi2   4.4.0-1046.53
  linux-image-4.4.0-1050-snapdragon  4.4.0-1050.54
  linux-image-4.4.0-66-generic    4.4.0-66.87
  linux-image-4.4.0-66-generic-lpae  4.4.0-66.87
  linux-image-4.4.0-66-lowlatency  4.4.0-66.87
  linux-image-4.4.0-66-powerpc-e500mc  4.4.0-66.87
  linux-image-4.4.0-66-powerpc-smp  4.4.0-66.87
  linux-image-4.4.0-66-powerpc64-emb  4.4.0-66.87
  linux-image-4.4.0-66-powerpc64-smp  4.4.0-66.87
  linux-image-generic             4.4.0.66.70
  linux-image-generic-lpae        4.4.0.66.70
  linux-image-gke                 4.4.0.1005.5
  linux-image-lowlatency          4.4.0.66.70
  linux-image-powerpc-e500mc      4.4.0.66.70
  linux-image-powerpc-smp         4.4.0.66.70
  linux-image-powerpc64-emb       4.4.0.66.70
  linux-image-powerpc64-smp       4.4.0.66.70
  linux-image-raspi2              4.4.0.1046.45
  linux-image-snapdragon          4.4.0.1050.42

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-3220-1
  CVE-2017-2636

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-66.87
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1005.6
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1046.53
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1050.54

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