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

DSA 4888-1: xen security update

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Debian Security Advisory DSA-4888-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 10, 2021   https://www.debian.org/security/faq
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Package : xen
CVE ID : CVE-2021-26933 CVE-2021-27379

Multiple vulnerabilities have been discovered in the Xen hypervisor,
which could result in denial of service, privilege escalation or memory
disclosure.

For the stable distribution (buster), these problems have been fixed in
version 4.11.4+99-g8bce4698f6-1.

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/