Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2021.3888
kernel-rt security and bug fix update
16 November 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Denial of Service -- Existing Account
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-43267 CVE-2021-20317
Reference: ESB-2021.3887
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:4646
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:4646-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4646
Issue date: 2021-11-15
CVE Names: CVE-2021-20317 CVE-2021-43267
=====================================================================
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: Insufficient validation of user-supplied sizes for the MSG_CRYPTO
message type (CVE-2021-43267)
* kernel: timer tree corruption leads to missing wakeup and system freeze
(CVE-2021-20317)
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 RHEL-8.5.z source tree
(BZ#2020036)
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/):
2005258 - CVE-2021-20317 kernel: timer tree corruption leads to missing wakeup and system freeze
2020362 - CVE-2021-43267 kernel: Insufficient validation of user-supplied sizes for the MSG_CRYPTO message type
6. Package List:
Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source:
kernel-rt-4.18.0-348.2.1.rt7.132.el8_5.src.rpm
x86_64:
kernel-rt-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-core-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-core-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-devel-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-modules-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debuginfo-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-devel-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-kvm-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-modules-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-modules-extra-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 8):
Source:
kernel-rt-4.18.0-348.2.1.rt7.132.el8_5.src.rpm
x86_64:
kernel-rt-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-core-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-core-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-devel-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-modules-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debuginfo-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-devel-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-modules-4.18.0-348.2.1.rt7.132.el8_5.x86_64.rpm
kernel-rt-modules-extra-4.18.0-348.2.1.rt7.132.el8_5.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-2021-20317
https://access.redhat.com/security/cve/CVE-2021-43267
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 2021 Red Hat, Inc.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=6ebv
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=rToY
-----END PGP SIGNATURE-----