A xen security update has been released for Debian GNU/Linux 11 to address multiple vulnerabilities.

DSA 5184-1: xen security update

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Debian Security Advisory DSA-5184-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
July 15, 2022   https://www.debian.org/security/faq
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Package : xen
CVE ID : CVE-2022-21123 CVE-2022-21125 CVE-2022-21166 CVE-2022-23816
CVE-2022-23825 CVE-2022-26362 CVE-2022-26363 CVE-2022-26364
CVE-2022-29900

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/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/