Ubuntu Security Notice USN-2807-1
10th November, 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 version:
- Ubuntu 14.04 LTS:
-
linux-image-4.2.0-18-lowlatency
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-powerpc64-emb
4.2.0-18.22~14.04.1
-
linux-image-4.2.0-18-generic
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-powerpc64-smp
4.2.0-18.22~14.04.1
-
linux-image-4.2.0-18-powerpc-smp
4.2.0-18.22~14.04.1
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
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.