USN-2804-1: Linux kernel (Trusty HWE) vulnerability
Ubuntu Security Notice USN-2804-1
9th November, 2015
linux-lts-trusty vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Summary
The system could be made to crash under certain conditions.
Software description
- linux-lts-trusty - Linux hardware enablement kernel from Trusty
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 12.04 LTS:
- linux-image-3.13.0-68-generic 3.13.0-68.111~precise1
- linux-image-3.13.0-68-generic-lpae 3.13.0-68.111~precise1
To update your system, please follow these instructions: http://ift.tt/17VXqjU.
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
from Ubuntu Security Notices http://ift.tt/1NGqK2y