x86/AMD: Debug Mask handling

CVE-2023-34328

What is CVE-2023-34328?

The vulnerability associated with Xen's handling of AMD CPUs introduces significant concerns for virtualization environments. Specifically, there are errors in how the Xen project manages the guest state for PV (Paravirtualized) vCPUs, leading to potential exploitation scenarios. A PV vCPU can manipulate the global descriptor table (GDT) by placing a breakpoint over it, which may allow it to exploit prior vulnerabilities, such as XSA-156 and CVE-2015-8104. This action can potentially result in complete CPU lock-ups, showcasing the critical need for patches and protective measures within systems utilizing Xen virtualization on AMD hardware.

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References