A xen security update has been released for Debian GNU/Linux 10 to address multiple vulnerabilities.

DSA 4812-1: xen security update

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Debian Security Advisory DSA-4812-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 15, 2020   https://www.debian.org/security/faq
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Package : xen
CVE ID : CVE-2020-29479 CVE-2020-29480 CVE-2020-29481 CVE-2020-29482
CVE-2020-29483 CVE-2020-29484 CVE-2020-29485 CVE-2020-29486
CVE-2020-29566 CVE-2020-29570 CVE-2020-29571

Multiple vulnerabilities have been discovered in the Xen hypervisor:

Several security issues affecting Xenstore could result in cross
domain access (denial of service, information leaks or privilege
escalation) or denial of service against xenstored.

Additional vulnerabilities could result in guest-to-host denial of
service.

For the stable distribution (buster), these problems have been fixed in
version 4.11.4+57-g41a822c392-2.

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/