The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 2.6.37-rc7 allows local users to cause a denial of service (panic) via a zero-length I/O request in a device ioctl to a SCSI device, related to an unaligned map. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4163.
https://patchwork.kernel.org/patch/363282/
https://exchange.xforce.ibmcloud.com/vulnerabilities/64496
http://www.securityfocus.com/bid/45660
http://www.redhat.com/support/errata/RHSA-2011-0007.html
http://secunia.com/advisories/42890
http://openwall.com/lists/oss-security/2010/11/30/7
http://openwall.com/lists/oss-security/2010/11/30/4
http://openwall.com/lists/oss-security/2010/11/29/1
http://lkml.org/lkml/2010/11/29/70