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AUSCERT External Security Bulletin Redistribution
ESB-2023.3168
kernel-rt security and bug fix update
5 June 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Resolution: Patch/Upgrade
CVE Names: CVE-2023-32233
Original Bulletin:
https://access.redhat.com/errata/RHSA-2023:3350
Comment: CVSS (Max): 7.8 CVE-2023-32233 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: Red Hat
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2023:3350-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:3350
Issue date: 2023-05-30
CVE Names: CVE-2023-32233
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.
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 (v. 8) - x86_64
Red Hat Enterprise Linux RT (v. 8) - 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: 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):
* smpboot: Scheduler frequency invariance went wobbly, disabling!
(BZ#2188316)
* Crash: kernel BUG at kernel/locking/rtmutex.c:1338! (BZ#2188722)
* kernel-rt: update RT source tree to the RHEL-8.8.z0 source tree.
(BZ#2196667)
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/):
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 (v. 8):
Source:
kernel-rt-4.18.0-477.13.1.rt7.276.el8_8.src.rpm
x86_64:
kernel-rt-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-core-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-core-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-devel-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-modules-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debuginfo-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-devel-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-kvm-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-modules-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-modules-extra-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
Red Hat Enterprise Linux RT (v. 8):
Source:
kernel-rt-4.18.0-477.13.1.rt7.276.el8_8.src.rpm
x86_64:
kernel-rt-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-core-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-core-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-devel-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-modules-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debuginfo-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-devel-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-modules-4.18.0-477.13.1.rt7.276.el8_8.x86_64.rpm
kernel-rt-modules-extra-4.18.0-477.13.1.rt7.276.el8_8.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-2023-32233
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 2023 Red Hat, Inc.
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