Integer overflow in X.org libXcursor 1.1.13 and earlier allows X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the _XcursorFileHeaderCreate function.
http://www.x.org/wiki/Development/Security/Advisory-2013-05-23
http://www.ubuntu.com/usn/USN-1856-1
http://www.securityfocus.com/bid/60121
http://www.openwall.com/lists/oss-security/2013/05/23/3
http://www.debian.org/security/2013/dsa-2681
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/106791.html