USN-2806-1: Linux kernel (Vivid HWE) vulnerability

10 November 2015

The system could be made to crash under certain conditions.

Releases

Packages

  • linux-lts-vivid - Linux hardware enablement kernel from Vivid

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

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-2800-1: linux-image-3.2.0-94-generic, linux-image-3.2.0-94-powerpc64-smp, linux-image-3.2.0-94-omap, linux-image-3.2.0-94-virtual, linux-image-3.2.0-94-highbank, linux-image-3.2.0-94-powerpc-smp, linux, linux-image-3.2.0-94-generic-pae
  • USN-2801-1: linux-image-3.13.0-68-powerpc-e500mc, linux-image-3.13.0-68-powerpc64-emb, linux-image-3.13.0-68-powerpc64-smp, linux-image-3.13.0-68-generic, linux-image-3.13.0-68-powerpc-smp, linux-image-3.13.0-68-generic-lpae, linux-image-3.13.0-68-powerpc-e500, linux-image-3.13.0-68-lowlatency, linux
  • USN-2802-1: linux-image-3.19.0-33-powerpc64-smp, linux-image-3.19.0-33-powerpc-e500mc, linux-image-3.19.0-33-generic, linux-image-3.19.0-33-powerpc64-emb, linux-image-3.19.0-33-lowlatency, linux-image-3.19.0-33-powerpc-smp, linux-image-3.19.0-33-generic-lpae, linux
  • USN-2803-1: linux-image-4.2.0-18-generic-lpae, linux-image-4.2.0-18-powerpc64-smp, linux-image-4.2.0-18-lowlatency, linux-image-4.2.0-18-powerpc-e500mc, linux-image-4.2.0-18-powerpc64-emb, linux-image-4.2.0-18-generic, linux-image-4.2.0-18-powerpc-smp, linux
  • USN-2804-1: linux-image-3.13.0-68-generic, linux-lts-trusty, linux-image-3.13.0-68-generic-lpae
  • USN-2805-1: linux-image-3.16.0-53-powerpc64-smp, linux-image-3.16.0-53-generic-lpae, linux-image-3.16.0-53-powerpc64-emb, linux-image-3.16.0-53-powerpc-e500mc, linux-lts-utopic, linux-image-3.16.0-53-lowlatency, linux-image-3.16.0-53-powerpc-smp, linux-image-3.16.0-53-generic
  • USN-2807-1: linux-image-4.2.0-18-generic-lpae, linux-image-4.2.0-18-powerpc64-smp, linux-image-4.2.0-18-lowlatency, linux-image-4.2.0-18-powerpc-e500mc, linux-image-4.2.0-18-powerpc64-emb, linux-image-4.2.0-18-generic, linux-lts-wily, linux-image-4.2.0-18-powerpc-smp