This update for xen fixes the following issues: - CVE-2022-26363, CVE-2022-26364: Fixed insufficient care with non-coherent mappings . - CVE-2022-21123, CVE-2022-21125, CVE-2022-21166: Fixed MMIO stale data vulnerabilities on x86 . - CVE-2022-26362: Fixed a race condition in typeref acquisition . - CVE-2022-33745: Fixed insufficient TLB flush for x86 PV guests in shadow mode . - CVE-2022-23816, CVE-2022-23825, CVE-2022-29900: Fixed RETBLEED vulnerability, arbitrary speculative code execution with return instructions . Fixed several upstream bugs . Special Instructions and Notes: Please reboot the system after installing this update.