Even the latest Ubuntu (11.10) isn't affected, having xorg version 1.10.4.

I think that was his point. "Every windows machine affected" doesn't mean Windows 7 only.

I think it's pretty clear: "Every Linux screen locker" means every screen locking program that runs on linux, not every version of linux.

The bug is in Xorg, if you have any screen-locker running on a version with the bug, then it can be bypassed.