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AUSCERT External Security Bulletin Redistribution
Important: redhat-virtualization-host security update
30 September 2019
AusCERT Security Bulletin Summary
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 7
Red Hat Enterprise Linux WS/Desktop 7
Impact/Access: Increased Privileges -- Existing Account
CVE Names: CVE-2019-14835
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Red Hat Security Advisory
Synopsis: Important: redhat-virtualization-host security update
Advisory ID: RHSA-2019:2924-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2924
Issue date: 2019-09-27
CVE Names: CVE-2019-14835
An update for redhat-release-virtualization-host and
redhat-virtualization-host is now available for Red Hat Virtualization 4.2
for Red Hat Enterprise Linux 7.6 EUS.
Red Hat Product Security has rated this update as having a security impact
of Important. 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 7-based RHEV-H for RHEV 4.2 (build requirements) - noarch, x86_64
Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS - noarch, x86_64
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 following packages have been upgraded to a later upstream version:
redhat-release-virtualization-host (4.2), redhat-virtualization-host (4.2).
* A buffer overflow flaw was found in the way Linux kernel's vhost
functionality that translates virtqueue buffers to IOVs, logged the buffer
descriptors during migration. A privileged guest user able to pass
descriptors with invalid length to the host when migration is underway,
could use this flaw to increase their privileges on the host.
For more details about the security issue(s), including the impact, a CVSS
score, 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/):
1750351 - Rebase RHV-H 4.2 EUS on RHEL-7.6.EUS #7
1750727 - CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration
6. Package List:
Red Hat Virtualization 4.2 Hypervisor for RHEL 7.6 EUS:
RHEL 7-based RHEV-H for RHEV 4.2 (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 2019 Red Hat, Inc.
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