Interpretation conflict in drivers/md/dm-snap-persistent.c in the Linux kernel through 3.11.6 allows remote authenticated users to obtain sensitive information or modify data via a crafted mapping to a snapshot block device.
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
http://rhn.redhat.com/errata/RHSA-2013-1436.html
http://rhn.redhat.com/errata/RHSA-2013-1449.html
http://rhn.redhat.com/errata/RHSA-2013-1450.html
http://rhn.redhat.com/errata/RHSA-2013-1460.html
http://rhn.redhat.com/errata/RHSA-2013-1490.html
http://rhn.redhat.com/errata/RHSA-2013-1519.html
http://rhn.redhat.com/errata/RHSA-2013-1520.html
http://rhn.redhat.com/errata/RHSA-2013-1783.html
http://rhn.redhat.com/errata/RHSA-2013-1860.html
https://bugzilla.redhat.com/show_bug.cgi?id=1004233
https://github.com/torvalds/linux/commit/e9c6a182649f4259db704ae15a91ac820e63b0ca
http://www.ubuntu.com/usn/USN-2015-1
http://www.ubuntu.com/usn/USN-2016-1
http://www.ubuntu.com/usn/USN-2040-1
http://www.ubuntu.com/usn/USN-2041-1
http://www.ubuntu.com/usn/USN-2042-1
http://www.ubuntu.com/usn/USN-2043-1
http://www.ubuntu.com/usn/USN-2044-1
http://www.ubuntu.com/usn/USN-2045-1
http://www.ubuntu.com/usn/USN-2046-1
http://www.ubuntu.com/usn/USN-2049-1
http://www.ubuntu.com/usn/USN-2050-1