This update for xen fixes the following issues: - CVE-2020-15563: Fixed inverted code paths in x86 dirty VRAM tracking . - CVE-2020-15565: Fixed insufficient cache write-back under VT-d . - CVE-2020-15566: Fixed incorrect error handling in event channel port allocation . - CVE-2020-15567: Fixed non-atomic modification of live EPT PTE . - CVE-2020-0543: Special Register Buffer Data Sampling aka "CrossTalk" . Additional upstream bug fixes