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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2023:4255-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:4255
Issue date:        2023-07-25
CVE Names:         CVE-2023-1281 CVE-2023-32233 
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4
Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4
Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 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 NFV E4S (v.8.4) - x86_64
Red Hat Enterprise Linux NFV TUS (v.8.4) - x86_64
Red Hat Enterprise Linux RT TUS (v.8.4) - 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: tcindex: use-after-free vulnerability in traffic control index
filter allows privilege escalation (CVE-2023-1281)

* kernel: netfilter: use-after-free in nf_tables when processing batch
requests can lead to privilege escalation (CVE-2023-32233)

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 RT source tree to the latest RHEL-8.4z18 Batch
(BZ#2209986)

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/):

2181847 - CVE-2023-1281 kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation
2196105 - CVE-2023-32233 kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

6. Package List:

Red Hat Enterprise Linux NFV E4S (v.8.4):

Source:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm

Red Hat Enterprise Linux NFV TUS (v.8.4):

Source:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm

Red Hat Enterprise Linux RT TUS (v.8.4):

Source:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.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-2023-1281
https://access.redhat.com/security/cve/CVE-2023-32233
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2023 Red Hat, Inc.
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