A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 8.4
RHSA-2022:5633-01: Important: kernel-rt security and bug fix update
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Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2022:5633-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:5633
Issue date: 2022-07-19
CVE Names: CVE-2020-29368 CVE-2021-4197 CVE-2021-4203
CVE-2022-1012 CVE-2022-1729 CVE-2022-32250
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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: Small table perturb size in the TCP source port generation
algorithm can lead to information leak (CVE-2022-1012)
* kernel: race condition in perf_event_open leads to privilege escalation
(CVE-2022-1729)
* kernel: a use-after-free write in the netfilter subsystem can lead to
privilege escalation to root (CVE-2022-32250)
* kernel: cgroup: Use open-time creds and namespace for migration perm
checks (CVE-2021-4197)
* kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses
(CVE-2021-4203)
* kernel: the copy-on-write implementation can grant unintended write
access because of a race condition in a THP mapcount check (CVE-2020-29368)
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.z10 source tree
(BZ#2087922)
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/):
1903244 - CVE-2020-29368 kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check
2035652 - CVE-2021-4197 kernel: cgroup: Use open-time creds and namespace for migration perm checks
2036934 - CVE-2021-4203 kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses
2064604 - CVE-2022-1012 kernel: Small table perturb size in the TCP source port generation algorithm can lead to information leak
2086753 - CVE-2022-1729 kernel: race condition in perf_event_open leads to privilege escalation
2092427 - CVE-2022-32250 kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root
6. Package List:
Red Hat Enterprise Linux Real Time for NFV EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v.8.4):
Source:
kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.src.rpm
x86_64:
kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.57.1.rt7.129.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-2020-29368
https://access.redhat.com/security/cve/CVE-2021-4197
https://access.redhat.com/security/cve/CVE-2021-4203
https://access.redhat.com/security/cve/CVE-2022-1012
https://access.redhat.com/security/cve/CVE-2022-1729
https://access.redhat.com/security/cve/CVE-2022-32250
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2022 Red Hat, Inc.
