USN-3159-1: Linux kernel vulnerability

20 December 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 expose sensitive information.

Software Description

  • linux - Linux kernel

Details

It was discovered that a race condition existed in the procfs environ_read function in the Linux kernel, leading to an integer underflow. A local attacker could use this to expose sensitive information (kernel memory).

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.2.0-119-generic - 3.2.0-119.162
linux-image-3.2.0-119-generic-pae - 3.2.0-119.162
linux-image-3.2.0-119-highbank - 3.2.0-119.162
linux-image-3.2.0-119-omap - 3.2.0-119.162
linux-image-3.2.0-119-powerpc-smp - 3.2.0-119.162
linux-image-3.2.0-119-powerpc64-smp - 3.2.0-119.162
linux-image-3.2.0-119-virtual - 3.2.0-119.162
linux-image-generic - 3.2.0.119.134
linux-image-generic-pae - 3.2.0.119.134
linux-image-highbank - 3.2.0.119.134
linux-image-omap - 3.2.0.119.134
linux-image-powerpc-smp - 3.2.0.119.134
linux-image-powerpc64-smp - 3.2.0.119.134
linux-image-virtual - 3.2.0.119.134

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