Debian Security Advisory 1494-2 – The vmsplice system call did not properly verify address arguments passed by user space processes, which allowed local attackers to overwrite arbitrary kernel memory, gaining root privileges. In the vserver-enabled kernels, a missing access check on certain symlinks in /proc enabled local attackers to access resources in other vservers.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/63598/dsa-1494-2.txt
Source: https://packetstormsecurity.com/files/63598/Debian-Linux-Security-Advisory-1494-2.html