I am going through following Ubuntu announcement:
http://www.ubuntu.com/usn/usn-2852-1/
USN-2852-1: Linux kernel (Raspberry Pi 2) vulnerability
Ubuntu Security Notice USN-2852-1
19th December, 2015
linux-raspi2 vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 15.10
Summary
The system could be made to provide access outside of namespace sandbox.
Can someone please advice how to fix this security on my pi?