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Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2019:0833-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2019:0833
Issue date:        2019-04-23
CVE Names:         CVE-2019-6974 CVE-2019-7221
====================================================================
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):

* Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
(CVE-2019-6974)

* Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the
preemption timer (CVE-2019-7221)

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.

Bug Fix(es):

* VM hangs on RHEL rt-kernel and OSP 13 [rhel-7.6.z] (BZ#1688673)

* kernel-rt: update to the RHEL7.6.z batch#4 source tree (BZ#1689417)

Users of kernel are advised to upgrade to these updated packages, which fix
these bugs.

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/):

1671904 - CVE-2019-7221 Kernel: KVM: nVMX: use-after-free of the hrtimer for emulation of the preemption timer
1671913 - CVE-2019-6974 Kernel: KVM: potential use-after-free via kvm_ioctl_create_device()
1688673 - VM hangs on RHEL rt-kernel and OSP 13 [rhel-7.6.z]
1689417 - kernel-rt: update to the RHEL7.6.z batch#4 source tree

6. Package List:

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

Source:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-957.12.1.rt56.927.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-957.12.1.rt56.927.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-devel-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-957.12.1.rt56.927.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-957.12.1.rt56.927.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-2019-6974
https://access.redhat.com/security/cve/CVE-2019-7221
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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