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AUSCERT External Security Bulletin Redistribution
ESB-2022.1681
kernel-rt security and bug fix update
20 April 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Resolution: Patch/Upgrade
CVE Names: CVE-2022-25636 CVE-2022-0492 CVE-2021-4083
Original Bulletin:
https://access.redhat.com/errata/RHSA-2022:1413
Comment: CVSS (Max): 7.8 CVE-2022-25636 (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-2022:1413-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:1413
Issue date: 2022-04-19
CVE Names: CVE-2021-4083 CVE-2022-0492 CVE-2022-25636
=====================================================================
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: fget: check that the fd still exists after getting a ref to it
(CVE-2021-4083)
* kernel: cgroups v1 release_agent feature may allow privilege escalation
(CVE-2022-0492)
* kernel: heap out of bounds write in nf_dup_netdev.c (CVE-2022-25636)
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.z8 source tree
(BZ#2059334)
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/):
2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it
2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation
2056830 - CVE-2022-25636 kernel: heap out of bounds write in nf_dup_netdev.c
6. Package List:
Red Hat Enterprise Linux Real Time for NFV EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.45.1.rt7.117.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.45.1.rt7.117.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.45.1.rt7.117.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.45.1.rt7.117.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-2021-4083
https://access.redhat.com/security/cve/CVE-2022-0492
https://access.redhat.com/security/cve/CVE-2022-25636
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 2022 Red Hat, Inc.
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