Race condition in the Radeon DRI driver for Linux kernel 2.6.8.1 allows local users with DRI privileges to execute arbitrary code as root.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10431
http://www.redhat.com/support/errata/RHSA-2005-366.html
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000945