This update for xen fixes the following issues: - CVE-2021-28702: Fixed PCI devices with RMRRs not deassigned correctly . - CVE-2021-28704, CVE-2021-28707, CVE-2021-28708: Fixed PoD operations on misaligned GFNs . - CVE-2021-28705, CVE-2021-28709: Fixed issues with partially successful P2M updates on x86 . - CVE-2021-28706: Fixed guests may exceed their designated memory limit . - Fixed 15sp4 uefi fv guest on 12sp5 host unable to bootup with sriov pci device plugin . - Upstream bug fixes . Special Instructions and Notes: Please reboot the system after installing this update.