The ivtvfb_ioctl function in drivers/media/video/ivtv/ivtvfb.c in the Linux kernel before 2.6.36-rc8 does not properly initialize a certain structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via an FBIOGET_VBLANK ioctl call.
https://bugzilla.redhat.com/show_bug.cgi?id=648666
http://www.securityfocus.com/bid/45062
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://www.debian.org/security/2010/dsa-2126
http://secunia.com/advisories/42890