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====================================================================                   
Red Hat Security Advisory

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2019:2830-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:2830
Issue date:        2019-09-20
CVE Names:         CVE-2019-14835
====================================================================
1. Summary:

An update for kernel-rt is now available 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:

Red Hat Enterprise Linux Realtime (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

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)

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/11258

The system must be rebooted for this update to take effect.

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

1750727 - CVE-2019-14835 kernel: vhost-net: guest to host kernel escape during migration

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-1062.1.2.rt56.1025.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1062.1.2.rt56.1025.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-1062.1.2.rt56.1025.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1062.1.2.rt56.1025.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1062.1.2.rt56.1025.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1062.1.2.rt56.1025.el7.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/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/kernel-vhost

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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