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

Synopsis:          Moderate: kernel-rt security and bug fix update
Advisory ID:       RHSA-2020:5026-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:5026
Issue date:        2020-11-10
CVE Names:         CVE-2019-20811 CVE-2020-14331
====================================================================
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 Moderate. 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 for Real Time (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: kernel: buffer over write in vgacon_scroll (CVE-2020-14331)

* kernel: net-sysfs: *_queue_add_kobject refcount issue (CVE-2019-20811)

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):

* [RHEL-7.9] net/ipv6/ip6_flowlabel.c:85 suspicious rcu_dereference_check()
usage! (kernel-rt-debug) (BZ#1836846)

* md/raid: sleeping function called from invalid context triggered by CKI
storage/swraid/trim test (BZ#1857872)

* Infinite looping when trying to acquire eventpoll->mtx during
eventpoll_release_file, 2nd try (BZ#1877695)

* kernel-rt: update to the latest RHEL7.9.z1 source tree (BZ#1883995)

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/):

1846439 - CVE-2019-20811 kernel: net-sysfs: *_queue_add_kobject refcount issue
1858679 - CVE-2020-14331 kernel: kernel: buffer over write in vgacon_scroll

6. Package List:

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

Source:
kernel-rt-3.10.0-1160.6.1.rt56.1139.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.6.1.rt56.1139.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm

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

Source:
kernel-rt-3.10.0-1160.6.1.rt56.1139.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.6.1.rt56.1139.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.6.1.rt56.1139.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.6.1.rt56.1139.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-2019-20811
https://access.redhat.com/security/cve/CVE-2020-14331
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2020 Red Hat, Inc.
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