Debian 11: DSA-5184-1 Critical: Xen Privilege Escalation Risks

Multiple vulnerabilities have been discovered in the Xen hypervisor, which
could result in privilege escalation. In addition this updates provides
mitigations for the "Retbleed" speculative execution attack and the
"MMIO stale data" vulnerabilities.

For additional information please refer to the following pages:
https://xenbits.xen.org/xsa/advisory-404.html
https://xenbits.xen.org/xsa/advisory-407.html

For the stable distribution (bullseye), these problems have been fixed in
version 4.14.5+24-g87d90d511c-1.

We recommend that you upgrade your xen packages.

For the detailed security status of xen please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/xen

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/