Xen Security Advisory 444 v3 (CVE-2023-34327,CVE-2023-34328) – x86/AMD: Debug Mask handling

Xen Security Advisory 444 v3 (CVE-2023-34327,CVE-2023-34328) – x86/AMD: Debug Mask handling

Open Source Security 

Posted by Xen . org security team on Oct 10

Xen Security Advisory CVE-2023-34327,CVE-2023-34328 / XSA-444
version 3

x86/AMD: Debug Mask handling

UPDATES IN VERSION 3
====================

Public release.

ISSUE DESCRIPTION
=================

AMD CPUs since ~2014 have extensions to normal x86 debugging functionality.
Xen supports guests using these extensions.

Unfortunately there are errors in Xen’s handling of the guest…
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