USN-1486-1: Linux kernel vulnerability

29 June 2012

linux vulnerability

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

  • Ubuntu 12.04 LTS


The system could be made to crash if it received specially crafted network traffic.

Software Description

  • linux - Linux kernel


A flaw was discovered in the Linux kernel’s NFSv4 (Network file system) handling of ACLs (access control lists). A remote NFS server (attacker) could cause a denial of service (OOPS).

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.2.0-26-generic - 3.2.0-26.41
linux-image-3.2.0-26-generic-pae - 3.2.0-26.41
linux-image-3.2.0-26-highbank - 3.2.0-26.41
linux-image-3.2.0-26-omap - 3.2.0-26.41
linux-image-3.2.0-26-powerpc-smp - 3.2.0-26.41
linux-image-3.2.0-26-powerpc64-smp - 3.2.0-26.41
linux-image-3.2.0-26-virtual - 3.2.0-26.41

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.