6.8.2 was released without this fix: http://cvs.freedesktop.org/xorg/xc/programs/Xserver/Xext/saver.c?only_with_tag=XORG-6_8-branch&r1=1.5%3AMAIN&tr1=&r2=1.2.4.2%3AXORG-6_8_2&tr2=&makepatch=1&diff_format=u Without it, anybody can crash X with the handily provided beforelight X crashing program/screensaver.
Tracking issue upstream at: https://bugs.freedesktop.org/show_bug.cgi?id=2479
Fixed in 6.8.2-11 in rawhide