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AUSCERT External Security Bulletin Redistribution
ESB-2023.1967
kernel-rt security and bug fix update
5 April 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Resolution: Patch/Upgrade
CVE Names: CVE-2023-0386 CVE-2023-0266 CVE-2022-4378
CVE-2022-4269
Original Bulletin:
https://access.redhat.com/errata/RHSA-2023:1584
Comment: CVSS (Max): 7.8 CVE-2023-0266 (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-2023:1584-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:1584
Issue date: 2023-04-04
CVE Names: CVE-2022-4269 CVE-2022-4378 CVE-2023-0266
CVE-2023-0386
=====================================================================
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 Real Time for NFV (v. 8) - x86_64
Red Hat Enterprise Linux for Real Time (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: stack overflow in do_proc_dointvec and proc_skip_spaces
(CVE-2022-4378)
* ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
(CVE-2023-0266)
* kernel: FUSE filesystem low-privileged user privileges escalation
(CVE-2023-0386)
* kernel: net: CPU soft lockup in TC mirred egress-to-ingress action
(CVE-2022-4269)
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):
* Lazy irq_work does not raise softirq on PREEMPT_RT [rhel-8] (BZ#2172163)
* The latest RHEL 8.7.z3 kernel changes need to be merged into the RT
source tree to keep source parity between the two kernels. (BZ#2172278)
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/):
2150272 - CVE-2022-4269 kernel: net: CPU soft lockup in TC mirred egress-to-ingress action
2152548 - CVE-2022-4378 kernel: stack overflow in do_proc_dointvec and proc_skip_spaces
2159505 - CVE-2023-0386 kernel: FUSE filesystem low-privileged user privileges escalation
2163379 - CVE-2023-0266 ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
6. Package List:
Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.src.rpm
x86_64:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-kvm-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 8):
Source:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.src.rpm
x86_64:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.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-2022-4269
https://access.redhat.com/security/cve/CVE-2022-4378
https://access.redhat.com/security/cve/CVE-2023-0266
https://access.redhat.com/security/cve/CVE-2023-0386
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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