The virBitmapParse function in util/virbitmap.c in libvirt before 1.1.2 allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) via a crafted bitmap, as demonstrated by a large nodeset value to numatune.
http://www.ubuntu.com/usn/USN-1954-1
http://www.openwall.com/lists/oss-security/2013/08/30/1
http://security.gentoo.org/glsa/glsa-201412-04.xml
http://secunia.com/advisories/60895
http://lists.opensuse.org/opensuse-updates/2013-10/msg00024.html
http://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=47b9127e883677a0d60d767030a147450e919a25