The viafb_ioctl_get_viafb_info function in drivers/video/via/ioctl.c in the Linux kernel before 2.6.36-rc5 does not properly initialize a certain structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via a VIAFB_GET_INFO ioctl call.
https://bugzilla.redhat.com/show_bug.cgi?id=648671
http://www.vupen.com/english/advisories/2011/0298
http://www.vupen.com/english/advisories/2011/0124
http://www.vupen.com/english/advisories/2011/0012
http://www.securityfocus.com/bid/43817
http://www.redhat.com/support/errata/RHSA-2011-0007.html
http://www.redhat.com/support/errata/RHSA-2010-0958.html
http://www.openwall.com/lists/oss-security/2010/10/25/3
http://www.openwall.com/lists/oss-security/2010/10/07/1
http://www.openwall.com/lists/oss-security/2010/10/06/6
http://www.openwall.com/lists/oss-security/2010/09/25/2
http://secunia.com/advisories/42932
http://secunia.com/advisories/42890
http://secunia.com/advisories/42801
http://secunia.com/advisories/42778
http://lkml.indiana.edu/hypermail//linux/kernel/1009.1/03392.html
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html