USN-2911-1: Linux kernel vulnerability

22 February 2016

linux 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 - Linux kernel

Details

It was discovered that the Linux kernel keyring subsystem contained a race between read and revoke operations. 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 12.04 LTS
linux-image-3.2.0-99-generic - 3.2.0-99.139
linux-image-3.2.0-99-generic-pae - 3.2.0-99.139
linux-image-3.2.0-99-highbank - 3.2.0-99.139
linux-image-3.2.0-99-omap - 3.2.0-99.139
linux-image-3.2.0-99-powerpc-smp - 3.2.0-99.139
linux-image-3.2.0-99-powerpc64-smp - 3.2.0-99.139
linux-image-3.2.0-99-virtual - 3.2.0-99.139

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