NVIDIA drivers (nvidia-drivers) before 1.0.7185, 1.0.9639, and 100.14.11, as used in Gentoo Linux and possibly other distributions, creates /dev/nvidia* device files with insecure permissions, which allows local users to modify video card settings, cause a denial of service (crash or physical video card damage), and obtain sensitive information.
https://bugs.gentoo.org/show_bug.cgi?id=183567
http://www.securityfocus.com/bid/25363
http://www.securityfocus.com/bid/25360
http://www.gentoo.org/security/en/glsa/glsa-200708-14.xml