Home / mailings [RHSA-2022:5224-01] Important: kernel-rt security and bug fix update
Posted on 28 June 2022
RedHat===================================================================== Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2022:5224-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:5224
Issue date: 2022-06-28
CVE Names: CVE-2020-29368 CVE-2022-1012 CVE-2022-1729
CVE-2022-1966 CVE-2022-27666
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2
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. 8.2) - x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) - 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-2022-1966)
* kernel: buffer overflow in IPsec ESP transformation code (CVE-2022-27666)
* 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 latest RHEL-8.2.z18 Batch
(BZ#2081080)
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
2061633 - CVE-2022-27666 kernel: buffer overflow in IPsec ESP transformation code
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-2022-1966 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. 8.2):
Source:
kernel-rt-4.18.0-193.87.1.rt13.137.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.87.1.rt13.137.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.87.1.rt13.137.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.87.1.rt13.137.el8_2.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-2022-1012
https://access.redhat.com/security/cve/CVE-2022-1729
https://access.redhat.com/security/cve/CVE-2022-1966
https://access.redhat.com/security/cve/CVE-2022-27666
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.
