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Alerts This Week
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Red Hat 8.4 RHSA-2023:4255-01 Important: Kernel-RT Privilege Escalation

red hat
Calendar Grey July 25, 2023
Dist Redhat Esm H88
A significant revision for the kernel-rt in Red Hat Enterprise Linux 8.4 targets vulnerabilities related to privilege elevation and overall system robustness.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 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):
* kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation (CVE-2023-1281)
* kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation (CVE-2023-32233)
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-8.4z18 Batch (BZ#2209986)

Topics%20covered

Topics Covered

security advisory privilege escalation bug fix important red hat enterprise kernel-rt real time kernel

References

https://access.redhat.com/security/cve/CVE-2023-1281 https://access.redhat.com/security/cve/CVE-2023-32233 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux NFV E4S (v.8.4):
Source: kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-kvm-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm
Red Hat Enterprise Linux NFV TUS (v.8.4):
Source: kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.97.1.rt7.172.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2023:4255-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:4255
Issue date: 2023-07-25

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 UpdateServices for SAP Solutions.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 privilege escalation bug fix important red hat enterprise kernel-rt real time kernel

Relevant Releases Architectures

Red Hat Enterprise Linux NFV E4S (v.8.4) - x86_64

Red Hat Enterprise Linux NFV TUS (v.8.4) - x86_64

Red Hat Enterprise Linux RT TUS (v.8.4) - x86_64

Bugs Fixed

2181847 - CVE-2023-1281 kernel: tcindex: use-after-free vulnerability in traffic control index filter allows privilege escalation

2196105 - CVE-2023-32233 kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

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