drivers/media/video/v4l2-compat-ioctl32.c in the Video4Linux (V4L) implementation in the Linux kernel before 2.6.36 on 64-bit platforms does not validate the destination of a memory copy operation, which allows local users to write to arbitrary kernel memory locations, and consequently gain privileges, via a VIDIOCSTUNER ioctl call on a /dev/video device, followed by a VIDIOCSMICROCODE ioctl call on this device.
http://www.vupen.com/english/advisories/2010/3321
http://www.ubuntu.com/usn/USN-1000-1
http://www.securitytracker.com/id?1024710
http://www.securityfocus.com/bid/44242
http://www.mandriva.com/security/advisories?name=MDVSA-2010:257
http://www.debian.org/security/2010/dsa-2126
http://secunia.com/advisories/42745
http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00008.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-December/052513.html