Linux kernel 2.6 before 2.6.11 does not restrict access to the N_MOUSE line discipline for a TTY, which allows local users to gain privileges by injecting mouse or keyboard events into other user sessions.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9460
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2005-366.html
http://www.mail-archive.com/linux-kernel%40vger.kernel.org/msg64704.html
http://linux.bkbits.net:8080/linux-2.6/cset%4041fa6464E1UuGu6zmketEYxm73KSyQ