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Red Hat 8.4: RHSA-2022-5633 Critical: Kernel-Rt Privilege Escalation

red hat
Calendar Grey July 27, 2022
Dist Redhat Esm H88
Essential kernel-rt security patch for Red Hat Enterprise Linux version 8.4 resolves various vulnerabilities and enhances system protection.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4 Extended Update Support

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.

Summary

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)

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation bug fix security fix important kernel-rt

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

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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat privilege escalation bug fix security fix important kernel-rt

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

Bugs Fixed

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

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