Debian Security Advisory 1699-1 – An array index error in zaptel, a set of drivers for telephony hardware, could allow users to crash the system or escalate their privileges by overwriting kernel memory.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73725/dsa-1699-1.txt
Source: https://packetstormsecurity.com/files/73725/Debian-Linux-Security-Advisory-1699-1.html