Linux version 3.8 and newer, which accounts for most modern desktop and server Linux systems, as well as most Android devices, is subject to a local privilege escalation attack.
http://perception-point.io/2016/01/14/analysis-and-exploitation-of-a-linux-kernel-vulnerability-cve-2016-0728/I don't have time to write a lot now (I'm posting from my phone at work), but basically this allows any untrusted application to gain full administrative permissions. There are situations which make this bug more difficult to exploit, but as the consequences are dire, you should patch any systems you maintain which are affected.
In case you missed it before:
This affects Android, at least most recent devices (from the past couple of years or so). If you have an Android device and you see a software update available,
install it now!Edit: In case anyone was wondering, we're not vulnerable. The server hosting this forum is running a kernel too old to be affected.