The sys_get_thread_area function in process.c in Linux 2.6 before 2.6.12.4 and 2.6.13 does not clear a data structure before copying it to userspace, which might allow a user process to obtain sensitive information.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9748
http://www.securityfocus.com/bid/15527
http://www.securityfocus.com/archive/1/428058/100/0/threaded
http://www.securityfocus.com/archive/1/428028/100/0/threaded
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0144.html
http://www.redhat.com/support/errata/RHSA-2006-0101.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:220
http://www.mandriva.com/security/advisories?name=MDKSA-2005:219
http://www.mandriva.com/security/advisories?name=MDKSA-2005:218
http://www.debian.org/security/2005/dsa-922
http://secunia.com/advisories/19252
http://secunia.com/advisories/18510
http://secunia.com/advisories/18056
http://secunia.com/advisories/17826
http://lkml.org/lkml/2005/8/3/36
http://linux.bkbits.net:8080/linux-2.6/cset%4042e81864gSEM90Oun0jA8dufpM3inw