USN-2807-1: Linux kernel (Wily HWE) vulnerability

Releases

• Ubuntu 14.04 ESM

Packages

• 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

• 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

• CVE-2015-5307

Related notices

• USN-2800-1: linux-image-3.2.0-94-generic-pae, linux-image-3.2.0-94-powerpc-smp, linux-image-3.2.0-94-highbank, linux, linux-image-3.2.0-94-virtual, linux-image-3.2.0-94-generic, linux-image-3.2.0-94-powerpc64-smp, linux-image-3.2.0-94-omap
• USN-2803-1: linux-image-4.2.0-18-generic-lpae, linux-image-4.2.0-18-generic, linux-image-4.2.0-18-powerpc-smp, linux-image-4.2.0-18-powerpc64-smp, linux, linux-image-4.2.0-18-powerpc64-emb, linux-image-4.2.0-18-lowlatency, linux-image-4.2.0-18-powerpc-e500mc
• USN-2801-1: linux-image-3.13.0-68-powerpc64-smp, linux-image-3.13.0-68-powerpc64-emb, linux-image-3.13.0-68-powerpc-smp, linux, linux-image-3.13.0-68-powerpc-e500mc, linux-image-3.13.0-68-lowlatency, linux-image-extra-3.13.0-68-generic, linux-image-3.13.0-68-generic, linux-image-3.13.0-68-powerpc-e500, linux-image-3.13.0-68-generic-lpae
• USN-2802-1: linux-image-3.19.0-33-powerpc64-smp, linux-image-3.19.0-33-lowlatency, linux, linux-image-3.19.0-33-powerpc-e500mc, linux-image-3.19.0-33-powerpc64-emb, linux-image-3.19.0-33-generic, linux-image-3.19.0-33-generic-lpae, linux-image-3.19.0-33-powerpc-smp
• USN-2804-1: linux-image-3.13.0-68-generic-lpae, linux-lts-trusty, linux-image-3.13.0-68-generic
• USN-2806-1: linux-image-3.19.0-33-powerpc64-smp, linux-image-3.19.0-33-lowlatency, linux-lts-vivid, linux-image-3.19.0-33-powerpc-e500mc, linux-image-3.19.0-33-powerpc64-emb, linux-image-3.19.0-33-generic, linux-image-extra-3.19.0-33-generic, linux-image-3.19.0-33-generic-lpae, linux-image-3.19.0-33-powerpc-smp
• USN-2805-1: linux-image-3.16.0-53-powerpc-smp, linux-lts-utopic, linux-image-3.16.0-53-generic-lpae, linux-image-3.16.0-53-powerpc-e500mc, linux-image-3.16.0-53-lowlatency, linux-image-3.16.0-53-generic, linux-image-3.16.0-53-powerpc64-emb, linux-image-3.16.0-53-powerpc64-smp, linux-image-extra-3.16.0-53-generic