[RHSA-2022:7280-01] Important: kernel-rt security and bug fix update

Tue Nov 1 18:55:33 UTC 2022

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2
Telecommunications Update Service.

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 Real Time TUS (v. 8.2) - x86_64
Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) - 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):

* A use-after-free in cls_route filter implementation may lead to privilege
escalation (CVE-2022-2588)

* Incomplete cleanup of multi-core shared buffers (aka SBDR)
(CVE-2022-21123)

* Incomplete cleanup of microarchitectural fill buffers (aka SBDS)
(CVE-2022-21125)

* Incomplete cleanup in specific special register write operations (aka
DRPW) (CVE-2022-21166)

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):

* Update RT source tree to the latest RHEL-8.2.z21 Batch (BZ#2100575)

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/):

2090237 - CVE-2022-21123 hw: cpu: Incomplete cleanup of multi-core shared buffers (aka SBDR)
2090240 - CVE-2022-21125 hw: cpu: Incomplete cleanup of microarchitectural fill buffers (aka SBDS)
2090241 - CVE-2022-21166 hw: cpu: Incomplete cleanup in specific special register write operations (aka DRPW)
2114849 - CVE-2022-2588 kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation

6. Package List:

Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2):

Source:
kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.src.rpm

x86_64:
kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm

Red Hat Enterprise Linux Real Time TUS (v. 8.2):

Source:
kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.src.rpm

x86_64:
kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.93.1.rt13.143.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-2022-2588
https://access.redhat.com/security/cve/CVE-2022-21123
https://access.redhat.com/security/cve/CVE-2022-21125
https://access.redhat.com/security/cve/CVE-2022-21166
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2022 Red Hat, Inc.
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