sysdeps/posix/readdir_r.c in the GNU C Library (aka glibc or libc6) 2.18 and earlier allows context-dependent attackers to cause a denial of service (out-of-bounds write and crash) or possibly execute arbitrary code via a crafted (1) NTFS or (2) CIFS image.
secunia.com/advisories/55113
www.mandriva.com/security/advisories?name=MDVSA-2013:283
www.openwall.com/lists/oss-security/2013/08/12/8
www.securityfocus.com/bid/61729
www.ubuntu.com/usn/USN-1991-1
bugzilla.redhat.com/show_bug.cgi?id=995839
security.gentoo.org/glsa/201503-04
sourceware.org/bugzilla/show_bug.cgi?id=14699
sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commitdiff%3Bh=91ce40854d0b7f865cf5024ef95a8026b76096f3