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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2021:2726-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:2726
Issue date:        2021-07-20
CVE Names:         CVE-2019-20934 CVE-2020-11668 CVE-2021-33033 
                   CVE-2021-33034 CVE-2021-33909 
=====================================================================

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 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: size_t-to-int conversion vulnerability in the filesystem layer
(CVE-2021-33909)

* kernel: use-after-free in net/bluetooth/hci_event.c when destroying an
hci_chan (CVE-2021-33034)

* kernel: use-after-free in show_numa_stats function (CVE-2019-20934)

* kernel: mishandles invalid descriptors in
drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)

* kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c
(CVE-2021-33033)

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):

* kernel-rt: update to the latest RHEL7.9.z7 source tree (BZ#1967333)

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/):

1824792 - CVE-2020-11668 kernel: mishandles invalid descriptors in
 drivers/media/usb/gspca/xirlink_cit.c
1902788 - CVE-2019-20934 kernel: use-after-free in show_numa_stats function
1961300 - CVE-2021-33033 kernel: use-after-free in cipso_v4_genopt in
 net/ipv4/cipso_ipv4.c
1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c
 when destroying an hci_chan
1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the
 filesystem layer

6. Package List:

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

Source:
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.36.2.rt56.1179.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm

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

Source:
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.36.2.rt56.1179.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.36.2.rt56.1179.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-2019-20934
https://access.redhat.com/security/cve/CVE-2020-11668
https://access.redhat.com/security/cve/CVE-2021-33033
https://access.redhat.com/security/cve/CVE-2021-33034
https://access.redhat.com/security/cve/CVE-2021-33909
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/RHSB-2021-006

8. Contact:

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

Copyright 2021 Red Hat, Inc.
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