The pkt_ioctl function in the pktcdvd block device ioctl handler
(pktcdvd.c) in Linux kernel 2.6.12-rc4 and earlier calls the wrong
function before passing an ioctl to the block device, which crosses
security boundaries by making kernel address space accessible from
user space and allows local users to cause a denial of service and
possibly execute arbitrary code, a similar vulnerability to
CVE-2005-1264.