Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2012-4544 Insufficient validation of kernel or ramdisk sizes in the Xen PV domain builder could result in denial of service. CVE-2012-5511 Several HVM control operations performed insufficient validation of input, which could result in denial of service through resource exhaustion. CVE-2012-5634 Incorrect interrupt handling when using VT-d hardware could result in denial of service. CVE-2013-0153 Insufficient restriction of interrupt access could result in denial of service.