SuSE
Stealth
A hacker that is known for his expertise in software and network trickery.
In 2000, found a vulnerability in kreatecd, a local root compromise for SuSE 6.x and Halloween Linux Version 4.
In 2009, Sebastian Krahmer identified a vulnerability in udevd where it incorrectly assumed that messages arriving on its NETLINK socket would always come from the kernel. Any local unprivileged user may send a unicast or multicast NETLINK message to udevd, which it will treat as a privileged message from the kernel. This would allow a user to (for example) instruct udevd to create a /dev/random device file with chosen minor and major device numbers, giving RWX permissions to any device that the attacker chooses. That's game over, kids.
Among other things, he wrote a paper entitled "Hardened OS exploitation techniques"; speaking of "PaX", and "GRSECURITY".
