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Red Hat Security Advisory

Synopsis: Important: redhat-virtualization-host security update
Advisory ID: RHSA-2019:2889-01
Product: Red Hat Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2019:2889
Issue date: 2019-09-24
CVE Names: CVE-2019-14835
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1. Summary:

An update for redhat-release-virtualization-host and
redhat-virtualization-host is now available for Red Hat Virtualization 4
for Red Hat Enterprise Linux 7.

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 (build requirements) – noarch, x86_64
Red Hat Virtualization 4 Hypervisor for RHEL 7 – noarch

3. Description:

The redhat-virtualization-host packages provide the Red Hat Virtualization
Host. 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 (4.3.5), redhat-virtualization-host
(4.3.5). (BZ#1751436, BZ#1754063)

Security Fix(es):

* 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.
(CVE-2019-14835)

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.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/2974891

5. Bugs fixed (https://bugzilla.redhat.com/):

1750727 – CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration
1754063 – Rebase RHV-H 4.3.5 on RHEL 7.7

6. Package List:

Red Hat Virtualization 4 Hypervisor for RHEL 7:

Source:
redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm

noarch:
redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm

RHEL 7-based RHEV-H for RHEV 4 (build requirements):

Source:
redhat-release-virtualization-host-4.3.5-4.el7ev.src.rpm
redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm

noarch:
redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm
redhat-virtualization-host-image-update-placeholder-4.3.5-4.el7ev.noarch.rpm

x86_64:
redhat-release-virtualization-host-4.3.5-4.el7ev.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2019-14835
https://access.redhat.com/security/vulnerabilities/kernel-vhost
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2019 Red Hat, Inc.
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