The do_tmem_op function in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service (host crash) and possibly have other unspecified impacts via unspecified vectors related to "broken locking checks" in an "error path." NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
https://security.gentoo.org/glsa/201604-03
https://exchange.xforce.ibmcloud.com/vulnerabilities/78268
http://www.securitytracker.com/id?1027482
http://www.securityfocus.com/bid/55410
http://www.openwall.com/lists/oss-security/2012/09/05/8
http://wiki.xen.org/wiki/Security_Announcements#XSA-15_multiple_TMEM_hypercall_vulnerabilities
http://security.gentoo.org/glsa/glsa-201309-24.xml
http://secunia.com/advisories/55082
http://secunia.com/advisories/50472
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00006.html