[USN-2807-1] Linux kernel (Wily HWE) vulnerability

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-2807-1
November 10, 2015

linux-lts-wily vulnerability
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

The system could be made to crash under certain conditions.

Software Description:
- linux-lts-wily: Linux hardware enablement kernel from Wily

Details:

Ben Serebrin discovered that the KVM hypervisor implementation in the Linux
kernel did not properly catch Alignment Check exceptions. An attacker in a
guest virtual machine could use this to cause a denial of service (system
crash) in the host OS.

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-4.2.0-18-generic    4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-generic-lpae  4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-lowlatency  4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-powerpc-e500mc  4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-powerpc-smp  4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-powerpc64-emb  4.2.0-18.22~14.04.1
  linux-image-4.2.0-18-powerpc64-smp  4.2.0-18.22~14.04.1

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
  http://www.ubuntu.com/usn/usn-2807-1
  CVE-2015-5307

Package Information:
  https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-18.22~14.04.1

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