Synopsis

Important: redhat-virtualization-host security update

Type/Severity

Security Advisory: Important

Topic

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.

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.

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

Affected Products

• Red Hat Virtualization 4 x86_64
• Red Hat Virtualization Host 4 x86_64

Fixes

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

CVEs

• CVE-2019-14835

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/kernel-vhost

Red Hat Virtualization 4

SRPM
redhat-release-virtualization-host-4.3.5-4.el7ev.src.rpm	SHA-256: 83628e269ffb421c37e50f0e25c882f5ead3539738198319d23b99b5d7732339
redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm	SHA-256: 733621171b902b46977550422c9caa6886b99fedc1ce8fc937bb93b6dc0c4adf
x86_64
redhat-release-virtualization-host-4.3.5-4.el7ev.x86_64.rpm	SHA-256: 3481126d550d604fe9e056cc39f7a33d06f12826a561c8d806003cee8c543ce2
redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm	SHA-256: aa810de3fab174de3db7840f4523ed23d45e3c85fbc8d474874f2d0166aec393
redhat-virtualization-host-image-update-placeholder-4.3.5-4.el7ev.noarch.rpm	SHA-256: 2adbafe7407468d00fd72971d09028baafe1d8dbc928aa141aafeb154845875a

Red Hat Virtualization Host 4

SRPM
redhat-virtualization-host-4.3.5-20190920.0.el7_7.src.rpm	SHA-256: 733621171b902b46977550422c9caa6886b99fedc1ce8fc937bb93b6dc0c4adf
x86_64
redhat-virtualization-host-image-update-4.3.5-20190920.0.el7_7.noarch.rpm	SHA-256: aa810de3fab174de3db7840f4523ed23d45e3c85fbc8d474874f2d0166aec393