Ubuntu 14.04.2 has been rescheduled for the 19th of February, 2015:
As you may know, the LTS versions of Ubuntu receive point releases which bring both security and kernel updates. Most of the time, Canonical respects its own timeline, except the cases when there is an important matter which are worth the delay.
This is the case with Ubuntu 14.04.2, which has been delayed with 2 weeks, from the 4th of February to the 19th of February.
Ubuntu 12.04 Precise Pangolin has received a new kernel, which fixes a few security flaws:
Recently, Canonical has updated the Kernel running on Ubuntu 12.04 to linux-image-3.2.0-76-generic (3.2.0-76.111) and fixed a bunch of security flaws.
In order to receive the update on your Ubuntu 12.04 or a derivative system, do:
$ sudo apt-get update
$ sudo apt-get dist-upgrade
After the upgrade has been successfully done, reboot your system.
Note: Due to an ABI change, the users will have to recompile all the third-party kernel modules installed, reinstall the linux-restricted-modules package and manually install the GPU drivers.