The Dispatch_Write function in proxy/dispatcher/idirectfbsurface_dispatcher.c in DirectFB 1.4.4 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via the Voodoo interface, which triggers an out-of-bounds write.
https://security.gentoo.org/glsa/201701-55
http://www.openwall.com/lists/oss-security/2014/05/15/10
http://www.mandriva.com/security/advisories?name=MDVSA-2015:223
http://secunia.com/advisories/58448
http://mail.directfb.org/pipermail/directfb-dev/2014-March/006805.html
http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00019.html