On October 21, Canonical has announced in a security notice that a new Linux kernel update is available for its Ubuntu 12.04 LTS (Precise Pangolin) operating system, fixing a single vulnerability found in the Linux kernel packages.
It was discovered that information could be leaked when reading broadcast messages from the notify_policy interface of the IPSec key_socket, allowing a local user to examine potentially sensitive information in kernel memory.
For more information please take a look at the CVE-2013-2237 reference, as it affects other Linux operating systems as well.
The security flaw can be fixed if you upgrade your system(s) to the linux-image-3.2.0-55 (3.2.0-55.85) package(s). To apply the update, run the Update Manager application of read the following instructions https://wiki.ubuntu.com/Security/Upgrades.
After the upgrade, you must reboot your computer for the changes to take effect!