USN-1968-1: Linux kernel vulnerabilities

27 September 2013

linux vulnerabilities

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

  • Ubuntu 12.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


Vince Weaver discovered a flaw in the perf subsystem of the Linux kernel on ARM platforms. A local user could exploit this flaw to gain privileges or cause a denial of service (system crash). (CVE-2013-4254)

A failure to validate block numbers was discovered in the Linux kernel’s implementation of the XFS filesystem. A local user can cause a denial of service (system crash) if they can mount, or cause to be mounted a corrupted or special crafted XFS filesystem. (CVE-2013-1819)

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.2.0-54-generic - 3.2.0-54.82
linux-image-3.2.0-54-generic-pae - 3.2.0-54.82
linux-image-3.2.0-54-highbank - 3.2.0-54.82
linux-image-3.2.0-54-omap - 3.2.0-54.82
linux-image-3.2.0-54-powerpc-smp - 3.2.0-54.82
linux-image-3.2.0-54-powerpc64-smp - 3.2.0-54.82
linux-image-3.2.0-54-virtual - 3.2.0-54.82

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.