drm.c in Linux kernel 2.6.10 to 2.6.13 creates a debug file in sysfs with world-readable and world-writable permissions, which allows local users to enable DRM debugging and obtain sensitive information.
http://www.securityfocus.com/bid/15154
http://www.securityfocus.com/advisories/9549
http://www.mandriva.com/security/advisories?name=MDKSA-2005:220
http://www.kernel.org/hg/linux-2.6/?cmd=changeset%3Bnode=d7067d7d1f92cba14963a430cfbd53098cbbc8fd
http://secunia.com/advisories/17280