Canonical announced earlier today, June 29th, in a security notice, that new Linux kernel updates for its Ubuntu 12.04 LTS (Precise Pangolin), Ubuntu 11.10 (Oneiric Ocelot), Ubuntu 11.04 (Natty Narwhal), Ubuntu 10.04 LTS (Lucid Lynx) and Ubuntu 8.04 LTS (Hardy Heron) operating systems is now available, fixing three important security vulnerabilities discovered in the Linux kernel packages by various developers.
The following vulnerability affects the Ubuntu 12.04 LTS and Ubuntu 11.10 kernels: CVE-2012-2375.
For details about the vulnerabilities found in the Linux kernel packages you can click on each one, as it affects other Linux operating systems as well.
The security flaws can be fixed if you upgrade your system(s) now. To apply the update, run the Update Manager application or follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
Don't forget to reboot your computer after the upgrade!