USN-3334-1: Linux kernel (Xenial HWE) vulnerability

Ubuntu Security Notice USN-3334-1

22nd June, 2017

linux-lts-xenial vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.04 LTS


The system could be made to run programs as an administrator.

Software description

  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty


USN-3328-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

It was discovered that the stack guard page for processes in the Linux
kernel was not sufficiently large enough to prevent overlapping with the
heap. An attacker could leverage this with another vulnerability to execute
arbitrary code and gain administrative privileges

Update instructions

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

Ubuntu 14.04 LTS:
linux-image-4.4.0-81-powerpc-smp 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-powerpc-e500mc 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-lowlatency 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-generic-lpae 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-generic 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-powerpc64-smp 4.4.0-81.104~14.04.1
linux-image-4.4.0-81-powerpc64-emb 4.4.0-81.104~14.04.1

To update your system, please follow these instructions:

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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.