Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2022.1027
kernel-rt security and bug fix update
11 March 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Resolution: Patch/Upgrade
CVE Names: CVE-2022-22942 CVE-2022-0847 CVE-2022-0492
CVE-2022-0435 CVE-2022-0330 CVE-2021-4154
CVE-2021-0920
Original Bulletin:
https://access.redhat.com/errata/RHSA-2022:0819
Comment: CVSS (Max): 8.8 CVE-2021-4154 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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:C/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-2022:0819-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:0819
Issue date: 2022-03-10
CVE Names: CVE-2021-0920 CVE-2021-4154 CVE-2022-0330
CVE-2022-0435 CVE-2022-0492 CVE-2022-0847
CVE-2022-22942
=====================================================================
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: improper initialization of the "flags" member of the new
pipe_buffer (CVE-2022-0847)
* kernel: Use After Free in unix_gc() which could result in a local
privilege escalation (CVE-2021-0920)
* kernel: local privilege escalation by exploiting the fsconfig syscall
parameter leads to container breakout (CVE-2021-4154)
* kernel: possible privileges escalation due to missing TLB flush
(CVE-2022-0330)
* kernel: remote stack overflow via kernel panic on systems using TIPC may
lead to DoS (CVE-2022-0435)
* kernel: cgroups v1 release_agent feature may allow privilege escalation
(CVE-2022-0492)
* kernel: failing usercopy allows for use-after-free exploitation
(CVE-2022-22942)
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 symbol '__rt_mutex_init' is exported GPL-only in kernel
4.18.0-348.2.1.rt7.132.el8_5 (BZ#2038423)
* kernel-rt: update RT source tree to the RHEL-8.5.z3 source tree
(BZ#2045589)
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/):
2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation
2034514 - CVE-2021-4154 kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout
2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush
2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation
2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS
2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation
2060795 - CVE-2022-0847 kernel: improper initialization of the "flags" member of the new pipe_buffer
6. Package List:
Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source:
kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.src.rpm
x86_64:
kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-kvm-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-modules-extra-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 8):
Source:
kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.src.rpm
x86_64:
kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
kernel-rt-modules-extra-4.18.0-348.20.1.rt7.150.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-2021-0920
https://access.redhat.com/security/cve/CVE-2021-4154
https://access.redhat.com/security/cve/CVE-2022-0330
https://access.redhat.com/security/cve/CVE-2022-0435
https://access.redhat.com/security/cve/CVE-2022-0492
https://access.redhat.com/security/cve/CVE-2022-0847
https://access.redhat.com/security/cve/CVE-2022-22942
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/RHSB-2022-002
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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