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Red Hat 8.2: RHSA-2022-7280-01 Important: Kernel-RT Privilege Escalation

red hat
Calendar Grey November 1, 2022
Dist Redhat Esm H88
An essential kernel-rt upgrade for Red Hat Enterprise Linux tackles vulnerabilities and rectifies bugs. Discover further details today.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Telecommunications Update Service

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):
* A use-after-free in cls_route filter implementation may lead to privilege escalation (CVE-2022-2588)
* Incomplete cleanup of multi-core shared buffers (aka SBDR) (CVE-2022-21123)
* Incomplete cleanup of microarchitectural fill buffers (aka SBDS) (CVE-2022-21125)
* Incomplete cleanup in specific special register write operations (aka DRPW) (CVE-2022-21166)
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):
* Update RT source tree to the latest RHEL-8.2.z21 Batch (BZ#2100575)

Topics%20covered

Topics Covered

security advisory kernel update privilege escalation bug fix Red Hat Enterprise Linux important real time kernel

References

https://access.redhat.com/security/cve/CVE-2022-2588 https://access.redhat.com/security/cve/CVE-2022-21123 https://access.redhat.com/security/cve/CVE-2022-21125 https://access.redhat.com/security/cve/CVE-2022-21166 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2):
Source: kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-kvm-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debuginfo-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-devel-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-kvm-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-modules-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-modules-extra-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time TUS (v. 8.2):
Source: kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.93.1.rt13.143.el8_2.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:7280-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:7280
Issue date: 2022-11-01

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Telecommunications Update Service.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 kernel update privilege escalation bug fix Red Hat Enterprise Linux important real time kernel

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time TUS (v. 8.2) - x86_64

Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) - x86_64

Bugs Fixed

2090237 - CVE-2022-21123 hw: cpu: Incomplete cleanup of multi-core shared buffers (aka SBDR)

2090240 - CVE-2022-21125 hw: cpu: Incomplete cleanup of microarchitectural fill buffers (aka SBDS)

2090241 - CVE-2022-21166 hw: cpu: Incomplete cleanup in specific special register write operations (aka DRPW)

2114849 - CVE-2022-2588 kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation

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