Stack-based buffer overflow in the xl command line utility in Xen 4.1.x through 4.5.x allows local guest administrators to gain privileges via a long configuration argument.
https://security.gentoo.org/glsa/201604-03
http://xenbits.xen.org/xsa/advisory-137.html
http://www.securitytracker.com/id/1032973
http://www.securityfocus.com/bid/75573
http://www.debian.org/security/2015/dsa-3414
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00041.html