A xen security update has been released for Fedora 31.

SECURITY: Fedora 31 Update: xen-4.12.3-8.fc31

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Fedora Update Notification
FEDORA-2020-6dd36a716c
2020-11-20 01:28:41.818164
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Name : xen
Product : Fedora 31
Version : 4.12.3
Release : 8.fc31
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:

revised patch for XSA-286 (mitigating performance impact) ---- x86 PV guest
INVLPG-like flushes may leave stale TLB entries [XSA-286, CVE-2020-27674]
(#1891092) ---- x86: Race condition in Xen mapping code [XSA-345] undue
deferral of IOMMU TLB flushes [XSA-346] unsafe AMD IOMMU page table updates
[XSA-347]
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ChangeLog:

* Tue Nov 3 2020 Michael Young - 4.12.3-8
- revised patch for XSA-286 (mitigating performance impact)
* Thu Oct 29 2020 Michael Young - 4.12.3-7
- x86 PV guest INVLPG-like flushes may leave stale TLB entries
[XSA-286, CVE-2020-27674] (#1891092)
* Tue Oct 20 2020 Michael Young - 4.12.3-6
- x86: Race condition in Xen mapping code [XSA-345, CVE-2020-27672]
(#1891097)
- undue deferral of IOMMU TLB flushes [XSA-346, CVE-2020-27671]
(#1891093)
- unsafe AMD IOMMU page table updates [XSA-347, CVE-2020-27670]
(#1891088)
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References:

[ 1 ] Bug #1891087 - CVE-2020-27670 xen: unsafe AMD IOMMU page table updates (XSA-347)
  https://bugzilla.redhat.com/show_bug.cgi?id=1891087
[ 2 ] Bug #1891089 - CVE-2020-27674 xen: x86 PV guest INVLPG-like flushes may leave stale TLB entries (XSA-286)
  https://bugzilla.redhat.com/show_bug.cgi?id=1891089
[ 3 ] Bug #1891091 - CVE-2020-27671 xen: undue deferral of IOMMU TLB flushes (XSA-346)
  https://bugzilla.redhat.com/show_bug.cgi?id=1891091
[ 4 ] Bug #1891096 - CVE-2020-27672 xen: x86: race condition in Xen mapping code (XSA-345)
  https://bugzilla.redhat.com/show_bug.cgi?id=1891096
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2020-6dd36a716c' 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