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Red Hat Enterprise Linux 8.4 RHSA-2023-4256-01 Important: Kernel Escalation

red hat
Calendar Grey July 25, 2023
Dist Redhat Esm H88
Crucial kernel patch and vulnerability fix for Red Hat Enterprise Linux 8.4 tackling urgent security concerns.
An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, and...

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 packages contain the Linux kernel, the core of any Linux operating system.
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):
* s390/qeth: cache link_info for ethtool (BZ#2174365)
* RHEL8.4 - kernel: fix __clear_user() inline assembly constraints (BZ#2192605)
* ice: ptp4l cpu usage spikes (BZ#2203288)
* 40%~70% block performance regression for localfs backend write between kernel-4.18.0-235.el8.x86_64 and kernel-4.18.0-277.el8.x86_64 (BZ#2204516)
* Invalid character detected by rpminspect in Documentation/translations/zh_CN/process/magic-number.rst (BZ#2208287)
* simultaneous writes to a page on xfs can result in zero-byte data (BZ#2208413)
* Windows Server 2019 guest randomly pauses with "KVM: entry failed, hardware error 0x80000021" [rhel8.8GA] (BZ#2211662)
* [Marvell 8.7 Bug] qedi shutdown handler hangs upon reboot (BZ#2215333)

Topics%20covered

Topics Covered

security advisory privilege escalation bug fix Red Hat Enterprise Linux important kernel CWE-416

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 BaseOS AUS (v.8.4):
Source: kernel-4.18.0-305.97.1.el8_4.src.rpm
noarch: kernel-abi-stablelists-4.18.0-305.97.1.el8_4.noarch.rpm kernel-doc-4.18.0-305.97.1.el8_4.noarch.rpm
x86_64: bpftool-4.18.0-305.97.1.el8_4.x86_64.rpm bpftool-debuginfo-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-core-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-cross-headers-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-core-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-debuginfo-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-devel-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-modules-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debug-modules-extra-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debuginfo-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-debuginfo-common-x86_64-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-devel-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-headers-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-modules-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-modules-extra-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-tools-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-tools-debuginfo-4.18.0-305.97.1.el8_4.x86_64.rpm kernel-tools-libs-4.18.0-305.97.1.el8_4.x86_64.rpm perf-4.18.0-305.97.1.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2023:4256-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:4256
Issue date: 2023-07-25

Topic

An update for kernel 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 Red Hat Enterprise Linux important kernel CWE-416

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS AUS (v.8.4) - noarch, x86_64

Red Hat Enterprise Linux BaseOS E4S (v.8.4) - aarch64, noarch, ppc64le, s390x, x86_64

Red Hat Enterprise Linux BaseOS TUS (v.8.4) - aarch64, noarch, ppc64le, s390x, 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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