USN-3036-1: Linux kernel (Utopic HWE) vulnerability

14 July 2016

linux-lts-utopic 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-utopic - Linux hardware enablement kernel from Utopic for Trusty

Details

Jan Stancek discovered that the Linux kernel’s memory manager did not properly handle moving pages mapped by the asynchronous I/O (AIO) ring buffer to the other nodes. A local attacker could use this to cause a denial of service (system crash).

Update instructions

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

Ubuntu 14.04 LTS
linux-image-3.16.0-77-generic - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-generic-lpae - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-lowlatency - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-powerpc-e500mc - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-powerpc-smp - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-powerpc64-emb - 3.16.0-77.99~14.04.1
linux-image-3.16.0-77-powerpc64-smp - 3.16.0-77.99~14.04.1

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. 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.

References