A xen security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: xen-4.14.0-12.fc33

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Fedora Update Notification
FEDORA-2020-d71fa5f0b9
2020-12-01 01:27:21.870041
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Name : xen
Product : Fedora 33
Version : 4.14.0
Release : 12.fc33
URL :   http://xen.org/
Summary : Xen is a virtual machine monitor
Description :
This package contains the XenD daemon and xm command line
tools, needed to manage virtual machines running under the
Xen hypervisor

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Update Information:

stack corruption from XSA-346 change [XSA-355] ---- Information leak via power
sidechannel [XSA-351]
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ChangeLog:

* Tue Nov 24 2020 Michael Young - 4.14.0-12
- stack corruption from XSA-346 change [XSA-355]
* Mon Nov 23 2020 Michael Young - 4.14.0-11
- support zstd compressed kernels (dom0 only) based on linux kernel code
* Tue Nov 10 2020 Michael Young - 4.14.0-10
- Information leak via power sidechannel [XSA-351, CVE-2020-28368]
(#1897146)
- add make as build requires
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References:

[ 1 ] Bug #1897145 - CVE-2020-28368 xen: information leak via power sidechannel
  https://bugzilla.redhat.com/show_bug.cgi?id=1897145
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-d71fa5f0b9' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys