Red Hat Security Advisory 2021-4648-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
efed1a8f4077bc4612ff4f66517074e78af2aa949ac9c1d0694d41fcc4c884e4
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:4648-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4648
Issue date: 2021-11-15
CVE Names: CVE-2021-20317 CVE-2021-28950 CVE-2021-43267
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4
Extended Update Support.
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 EUS (v.8.4) - x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (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: 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)
* kernel: fuse: stall on CPU can occur because a retry loop continually
finds the same bad inode (CVE-2021-28950)
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-8.4.z5 source tree
(BZ#2017122)
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/):
1941762 - CVE-2021-28950 kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode
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 EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.28.1.rt7.100.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.28.1.rt7.100.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.28.1.rt7.100.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.28.1.rt7.100.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-2021-20317
https://access.redhat.com/security/cve/CVE-2021-28950
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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=KHoR
-----END PGP SIGNATURE-----
--
RHSA-announce mailing list
RHSA-announce@redhat.com
https://listman.redhat.com/mailman/listinfo/rhsa-announce