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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2021:4871-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4871
Issue date:        2021-11-30
CVE Names:         CVE-2020-36385 CVE-2021-20317 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 8.2
Extended Update Support.

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 CodeReady Linux Builder EUS (v. 8.2) - aarch64, ppc64le, x86_64
Red Hat Enterprise Linux BaseOS EUS (v. 8.2) - aarch64, noarch, ppc64le, s390x,
 x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* kernel: use-after-free in drivers/infiniband/core/ucma.c ctx
use-after-free (CVE-2020-36385)

* kernel: timer tree corruption leads to missing wakeup and system freeze
(CVE-2021-20317)

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):

* [IBM 8.4] [P10] P10 hardware counter (performance counters/perf:) support
(BZ#1994075)

* RHEL8.1 Snapshot1 - [4.18.0-128.el8.ppc64le] [ Brazos 31TB/192 Core ]
While running upstream kernel selftest case system crashed (TM)
(BZ#1996057)

* [kernel-debug] WARNING: possible circular locking dependency detected
(module_mutex & text_mutex) (BZ#2013777)

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/):

1974319 - CVE-2020-36385 kernel: use-after-free in
 drivers/infiniband/core/ucma.c ctx use-after-free
2005258 - CVE-2021-20317 kernel: timer tree corruption leads to missing wakeup
 and system freeze

6. Package List:

Red Hat Enterprise Linux BaseOS EUS (v. 8.2):

Source:
kernel-4.18.0-193.70.1.el8_2.src.rpm

aarch64:
bpftool-4.18.0-193.70.1.el8_2.aarch64.rpm
bpftool-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-core-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-cross-headers-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-core-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-devel-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-modules-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-modules-extra-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-devel-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-headers-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-modules-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-modules-extra-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-tools-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-tools-libs-4.18.0-193.70.1.el8_2.aarch64.rpm
perf-4.18.0-193.70.1.el8_2.aarch64.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
python3-perf-4.18.0-193.70.1.el8_2.aarch64.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm

noarch:
kernel-abi-whitelists-4.18.0-193.70.1.el8_2.noarch.rpm
kernel-doc-4.18.0-193.70.1.el8_2.noarch.rpm

ppc64le:
bpftool-4.18.0-193.70.1.el8_2.ppc64le.rpm
bpftool-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-core-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-cross-headers-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-core-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-devel-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-modules-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-modules-extra-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-devel-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-headers-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-modules-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-modules-extra-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-tools-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-tools-libs-4.18.0-193.70.1.el8_2.ppc64le.rpm
perf-4.18.0-193.70.1.el8_2.ppc64le.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
python3-perf-4.18.0-193.70.1.el8_2.ppc64le.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm

s390x:
bpftool-4.18.0-193.70.1.el8_2.s390x.rpm
bpftool-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-core-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-cross-headers-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-core-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-devel-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-modules-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debug-modules-extra-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-debuginfo-common-s390x-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-devel-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-headers-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-modules-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-modules-extra-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-tools-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-core-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-devel-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-modules-4.18.0-193.70.1.el8_2.s390x.rpm
kernel-zfcpdump-modules-extra-4.18.0-193.70.1.el8_2.s390x.rpm
perf-4.18.0-193.70.1.el8_2.s390x.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm
python3-perf-4.18.0-193.70.1.el8_2.s390x.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.s390x.rpm

x86_64:
bpftool-4.18.0-193.70.1.el8_2.x86_64.rpm
bpftool-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-core-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-cross-headers-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-core-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-devel-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-modules-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-modules-extra-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-devel-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-headers-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-modules-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-modules-extra-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-tools-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-tools-libs-4.18.0-193.70.1.el8_2.x86_64.rpm
perf-4.18.0-193.70.1.el8_2.x86_64.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
python3-perf-4.18.0-193.70.1.el8_2.x86_64.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm

Red Hat CodeReady Linux Builder EUS (v. 8.2):

aarch64:
bpftool-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-debuginfo-common-aarch64-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
kernel-tools-libs-devel-4.18.0-193.70.1.el8_2.aarch64.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.aarch64.rpm

ppc64le:
bpftool-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
kernel-tools-libs-devel-4.18.0-193.70.1.el8_2.ppc64le.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.ppc64le.rpm

x86_64:
bpftool-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debug-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-debuginfo-common-x86_64-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-tools-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
kernel-tools-libs-devel-4.18.0-193.70.1.el8_2.x86_64.rpm
perf-debuginfo-4.18.0-193.70.1.el8_2.x86_64.rpm
python3-perf-debuginfo-4.18.0-193.70.1.el8_2.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-2020-36385
https://access.redhat.com/security/cve/CVE-2021-20317
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 2021 Red Hat, Inc.
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