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USN-2801-1: Linux kernel vulnerability

10 November 2015

The system could be made to crash under certain conditions.

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Releases

Packages

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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 14.04

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

Related notices

  • USN-2807-1: linux-image-4.2.0-18-lowlatency, linux-image-4.2.0-18-generic, linux-image-4.2.0-18-powerpc64-emb, linux-lts-wily, linux-image-4.2.0-18-powerpc-smp, linux-image-extra-4.2.0-18-generic, linux-image-4.2.0-18-powerpc64-smp, linux-image-4.2.0-18-powerpc-e500mc, linux-image-4.2.0-18-generic-lpae
  • USN-2800-1: linux-image-3.2.0-94-generic-pae, linux-image-3.2.0-94-generic, linux, linux-image-3.2.0-94-virtual, linux-image-3.2.0-94-omap, linux-image-3.2.0-94-powerpc64-smp, linux-image-3.2.0-94-highbank, linux-image-3.2.0-94-powerpc-smp
  • USN-2803-1: linux-image-4.2.0-18-lowlatency, linux-image-4.2.0-18-generic, linux-image-4.2.0-18-powerpc64-emb, linux-image-4.2.0-18-generic-lpae, linux, linux-image-4.2.0-18-powerpc-smp, linux-image-4.2.0-18-powerpc64-smp, linux-image-4.2.0-18-powerpc-e500mc
  • USN-2802-1: linux-image-3.19.0-33-powerpc-smp, linux, linux-image-3.19.0-33-lowlatency, linux-image-3.19.0-33-powerpc64-emb, linux-image-3.19.0-33-generic, linux-image-3.19.0-33-powerpc-e500mc, linux-image-3.19.0-33-powerpc64-smp, linux-image-3.19.0-33-generic-lpae
  • USN-2804-1: linux-image-3.13.0-68-generic, linux-image-3.13.0-68-generic-lpae, linux-lts-trusty
  • USN-2806-1: linux-image-extra-3.19.0-33-generic, linux-image-3.19.0-33-powerpc-smp, linux-image-3.19.0-33-lowlatency, linux-lts-vivid, linux-image-3.19.0-33-powerpc64-emb, linux-image-3.19.0-33-generic, linux-image-3.19.0-33-powerpc-e500mc, linux-image-3.19.0-33-powerpc64-smp, linux-image-3.19.0-33-generic-lpae
  • USN-2805-1: linux-image-extra-3.16.0-53-generic, linux-image-3.16.0-53-powerpc64-smp, linux-lts-utopic, linux-image-3.16.0-53-powerpc-smp, linux-image-3.16.0-53-generic-lpae, linux-image-3.16.0-53-generic, linux-image-3.16.0-53-lowlatency, linux-image-3.16.0-53-powerpc-e500mc, linux-image-3.16.0-53-powerpc64-emb

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