USN-3333-1: Linux kernel (HWE) vulnerability

22 June 2017

linux-hwe vulnerability

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

  • Ubuntu 16.04 LTS


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

Software Description

  • linux-hwe - Linux hardware enablement (HWE) kernel


USN-3326-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.10. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04 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 versions:

Ubuntu 16.04 LTS
linux-image-4.8.0-56-generic - 4.8.0-56.61~16.04.1
linux-image-4.8.0-56-generic-lpae - 4.8.0-56.61~16.04.1
linux-image-4.8.0-56-lowlatency - 4.8.0-56.61~16.04.1
linux-image-generic-hwe-16.04 -
linux-image-generic-lpae-hwe-16.04 -
linux-image-lowlatency-hwe-16.04 -

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.