USN-2585-1: Linux kernel vulnerability

30 April 2015

linux vulnerability

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

  • Ubuntu 12.04 LTS


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

Software Description

  • linux - Linux kernel


It was discovered that the Linux kernel’s IPv6 networking stack has a flaw that allows using route advertisement (RA) messages to set the ‘hop_limit’ to values that are too low. An unprivileged attacker on a local network could exploit this flaw to cause a denial of service (IPv6 messages dropped).

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.2.0-82-generic - 3.2.0-82.119
linux-image-3.2.0-82-generic-pae - 3.2.0-82.119
linux-image-3.2.0-82-highbank - 3.2.0-82.119
linux-image-3.2.0-82-omap - 3.2.0-82.119
linux-image-3.2.0-82-powerpc-smp - 3.2.0-82.119
linux-image-3.2.0-82-powerpc64-smp - 3.2.0-82.119
linux-image-3.2.0-82-virtual - 3.2.0-82.119

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. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.