CVE-2012-3494

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CVE-2012-3494

Summary:

Details: The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.

References: http://secunia.com/advisories/50472, http://secunia.com/advisories/50530, http://secunia.com/advisories/51413, http://secunia.com/advisories/55082, http://security.gentoo.org/glsa/glsa-201309-24.xml, http://support.citrix.com/article/CTX134708, http://www.debian.org/security/2012/dsa-2544, https://security.gentoo.org/glsa/201604-03, http://support.citrix.com/article/CTX134708, https://bugzilla.redhat.com/show_bug.cgi?id=851139, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00005.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html, http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html, http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html, http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html, http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html, http://osvdb.org/85197, http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability, http://www.openwall.com/lists/oss-security/2012/09/05/5, http://www.securityfocus.com/bid/55400, http://www.securitytracker.com/id?1027479, https://exchange.xforce.ibmcloud.com/vulnerabilities/78265