Vulnerability Information
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Vulnerability Title
N/A
Vulnerability Description
inappropriate x86 IOMMU timeout detection / handling IOMMUs process commands issued to them in parallel with the operation of the CPU(s) issuing such commands. In the current implementation in Xen, asynchronous notification of the completion of such commands is not used. Instead, the issuing CPU spin-waits for the completion of the most recently issued command(s). Some of these waiting loops try to apply a timeout to fail overly-slow commands. The course of action upon a perceived timeout actually being detected is inappropriate: - on Intel hardware guests which did not originally cause the timeout may be marked as crashed, - on AMD hardware higher layer callers would not be notified of the issue, making them continue as if the IOMMU operation succeeded.
CVSS Information
N/A
Vulnerability Type
N/A
Vulnerability Title
Cambridge Xen 安全漏洞
Vulnerability Description
Xen是英国剑桥（Cambridge）大学的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上，并支持在运行时进行迁移，保证正常运行并且避免宕机。 XEN 存在安全漏洞，该漏洞源于Inappropriate X86 IOMMU Timeout可以绕过限制以提升权限。在客户系统中，攻击者可利用该漏洞升级他在主机系统上的特权。
CVSS Information
N/A
Vulnerability Type
N/A