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Ubuntu 14.04 LTS USN-2805-1 Moderate: KVM Denial of Service Crash

ubuntu
Calendar Grey November 10, 2015
Scroller Ubuntu
The Ubuntu Security Advisory details a flaw in the KVM kernel that may lead to system crashes, providing instructions for applying patches and links for further information.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux-lts-utopic: Linux hardware enablement kernel from Utopic

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.

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash linux kernel kvm issue

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.16.0-53-generic   3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-generic-lpae  3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-lowlatency  3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-powerpc-e500mc  3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-powerpc-smp  3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-powerpc64-emb  3.16.0-53.72~14.04.1
  linux-image-3.16.0-53-powerpc64-smp  3.16.0-53.72~14.04.1

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

https://ubuntu.com/security/notices/USN-2805-1

CVE-2015-5307

Severity
important
Lowest
Low
Medium
High
Critical

November 10, 2015

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash linux kernel kvm issue

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-53.72~14.04.1

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