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Ubuntu Security Notice USN-1968-1
September 27, 2013

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

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

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.

References:
  http://www.ubuntu.com/usn/usn-1968-1
  CVE-2013-1819, CVE-2013-4254

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.2.0-54.82