Get the Whitepaper called Windows Kernel Exploitation Tutorial Part 7: Uninitialized Heap Variable.
You can download it from the following link: https://packetstormsecurity.com/files/download/146862/windows-kernel-exploitation-tutorial-part-7-uninitialized-heap-variable.pdf
Source: https://packetstormsecurity.com/files/146862/Windows-Kernel-Exploitation-Tutorial-Part-7-Uninitialized-Heap-Variable.html