Hello Linux Geeksters. As you may know, Canonical has updated the kernels of all the supported Ubuntu systems: Ubuntu 14.04 Trusty Tahr, Ubuntu 13.10 Saucy Salamander, Ubuntu 12.10 Quantal Quetzal, Ubuntu 12.04 Precise Pangolin and Ubuntu 10.04 Lucid Lynx, due to the fact that it had some security issues, allowing unprivileged users to cause denial of service to the system and get root access.
While the Ubuntu systems are not powered by the same kernel version, this issue has been spotted and fixed on all the systems. Now, Ubuntu 14.04 Trusty Tahr runs Kernel 3.13.0-24.47.
Also, the Ubuntu developers have removed another security threat on Ubuntu 14.04 Trusty Tahr, that permitted the users to bypass the new lock screen.
To receive the latest updates, all you have to do is perform a normal system upgrade:
$ sudo apt-get update
$ sudo apt-get dist-upgrade
And reboot the system:
$ sudo reboot
After the update the users have to re-register the NVIDIA module kernels (if any) if the system fails to boot. Also, all the third party kernel modules will have to be reinstalled and recompiled while the linux-restricted-modules also require to be updated.