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AUSCERT External Security Bulletin Redistribution
Red Hat Virtualization Host security, bug fix and
enhancement update (4.4.4-2)
24 March 2021
AusCERT Security Bulletin Summary
Product: Virtualization Host
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2020-27827
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Red Hat Security Advisory
Synopsis: Moderate: Red Hat Virtualization Host security, bug fix and enhancement update (4.4.4-2)
Advisory ID: RHSA-2021:0976-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0976
Issue date: 2021-03-23
CVE Names: CVE-2020-27827
An update for imgbased, redhat-release-virtualization-host and
redhat-virtualization-host is now available for Red Hat Virtualization 4
for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.
2. Relevant releases/architectures:
RHEL 8-based RHEV-H for RHEV 4 (build requirements) - noarch, x86_64
Red Hat Virtualization 4 Hypervisor for RHEL 8 - noarch
The redhat-virtualization-host packages provide the Red Hat Virtualization
Host. These packages include redhat-release-virtualization-host,
ovirt-node, and rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are
installed using a special build of Red Hat Enterprise Linux with only the
packages required to host virtual machines. RHVH features a Cockpit user
interface for monitoring the host's resources and performing administrative
The ovirt-node-ng packages provide the Red Hat Virtualization Host. These
packages include redhat-release-virtualization-host, ovirt-node, and
rhev-hypervisor. Red Hat Virtualization Hosts (RHVH) are installed using a
special build of Red Hat Enterprise Linux with only the packages required
to host virtual machines. RHVH features a Cockpit user interface for
monitoring the host's resources and performing administrative tasks.
The following packages have been upgraded to a later upstream version:
redhat-release-virtualization-host (4.4.4), redhat-virtualization-host
Changes to the imgbased component:
* Previously, the chronyd symlink was removed during the upgrade process.
As a result, the chronyd service was disabled following the upgrade.
In this release, the chronyd service is enabled after upgrade. (BZ#1903777)
* lldp/openvswitch: denial of service via externally triggered memory leak
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
5. Bugs fixed (https://bugzilla.redhat.com/):
1903777 - chronyd is disabled after upgrading RHV-H 4.4.2 -> 4.4.3
1915877 - Rebase RHV-H 4.4.4 on RHEL 8.3.1
1916659 - Upgrade imgbased to 1.2.16
1921438 - CVE-2020-27827 lldp/openvswitch: denial of service via externally triggered memory leak
1932763 - Rebase RHV-H 4.4.4 on FDP 2.11 (21B)
6. Package List:
Red Hat Virtualization 4 Hypervisor for RHEL 8:
RHEL 8-based RHEV-H for RHEV 4 (build requirements):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <firstname.lastname@example.org>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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