A vulnerability has been reported in Xen, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service).
The vulnerability is caused due to the application not clearing the NT flag when handling the SYSENTER instruction, which can be exploited to cause a general protection fault on an IRET and crash the host.
Successful exploitation requires that a 64-bit ParaVirtual OPerationS (PVOPS) guest is used.
The vulnerability is reported in versions 3.1 and later running on Intel platforms.
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Subject: Xen SYSENTER Handling NT Flag Denial of Service Vulnerability
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