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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2022:1107-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2022:1107
Issue date:        2022-03-29
CVE Names:         CVE-2021-0920 CVE-2021-4083 CVE-2022-0330 
                   CVE-2022-22942 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.6
Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.6 Update Services for SAP
Solutions.

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 Server AUS (v. 7.6) - noarch, x86_64
Red Hat Enterprise Linux Server E4S (v. 7.6) - noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.6) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.6) - noarch, 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 unix_gc() which could result in a local
privilege escalation (CVE-2021-0920)

* kernel: fget: check that the fd still exists after getting a ref to it
(CVE-2021-4083)

* kernel: possible privileges escalation due to missing TLB flush
(CVE-2022-0330)

* kernel: failing usercopy allows for use-after-free exploitation
(CVE-2022-22942)

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.

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/):

2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after
 getting a ref to it
2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result
 in a local privilege escalation
2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing
 TLB flush
2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free
 exploitation

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.6):

Source:
kernel-3.10.0-957.92.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-957.92.1.el7.noarch.rpm
kernel-doc-3.10.0-957.92.1.el7.noarch.rpm

x86_64:
bpftool-3.10.0-957.92.1.el7.x86_64.rpm
kernel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-headers-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-957.92.1.el7.x86_64.rpm
perf-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.6):

Source:
kernel-3.10.0-957.92.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-957.92.1.el7.noarch.rpm
kernel-doc-3.10.0-957.92.1.el7.noarch.rpm

ppc64le:
kernel-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debug-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-devel-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-headers-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-tools-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-957.92.1.el7.ppc64le.rpm
perf-3.10.0-957.92.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
python-perf-3.10.0-957.92.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm

x86_64:
kernel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-headers-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-957.92.1.el7.x86_64.rpm
perf-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 7.6):

Source:
kernel-3.10.0-957.92.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-957.92.1.el7.noarch.rpm
kernel-doc-3.10.0-957.92.1.el7.noarch.rpm

x86_64:
bpftool-3.10.0-957.92.1.el7.x86_64.rpm
kernel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-devel-3.10.0-957.92.1.el7.x86_64.rpm
kernel-headers-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-957.92.1.el7.x86_64.rpm
perf-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.6):

x86_64:
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.6):

ppc64le:
kernel-debug-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-957.92.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional TUS (v. 7.6):

x86_64:
kernel-debug-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-957.92.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.92.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.92.1.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-2021-0920
https://access.redhat.com/security/cve/CVE-2021-4083
https://access.redhat.com/security/cve/CVE-2022-0330
https://access.redhat.com/security/cve/CVE-2022-22942
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 2022 Red Hat, Inc.
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