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

--------------------------------------------------------------------------------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]
--------------------------------------------------------------------------------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)
--------------------------------------------------------------------------------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
--------------------------------------------------------------------------------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
https://dnf.readthedocs.io/en/latest/command_ref.html

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/security/
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