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Red Hat: RHSA-2023-0294-01 Crucial Kernel-RT Security Patch

red hat
Calendar Grey March 10, 2022
Dist Redhat Esm H88
A significant patch for kernel-rt on Red Hat Enterprise Linux features critical vulnerabilities addressed and various bug resolutions. System restart necessary.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 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: improper initialization of the "flags" member of the new pipe_buffer (CVE-2022-0847)
* kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)
* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
* kernel: cgroups v1 release_agent feature may allow privilege escalation (CVE-2022-0492)
* kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)
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.z16 Batch (BZ#2057698)

Topics%20covered

Topics Covered

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

References

https://access.redhat.com/security/cve/CVE-2021-4083 https://access.redhat.com/security/cve/CVE-2022-0330 https://access.redhat.com/security/cve/CVE-2022-0492 https://access.redhat.com/security/cve/CVE-2022-0847 https://access.redhat.com/security/cve/CVE-2022-22942 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/RHSB-2022-002

Package List

Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-kvm-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debuginfo-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-devel-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-kvm-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-modules-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-modules-extra-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.79.1.rt13.129.el8_2.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:0821-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:0821
Issue date: 2022-03-10

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Extended 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 impact important fix kernel-rt

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

Bugs Fixed

2029923 - CVE-2021-4083 kernel: fget: check that the fd still exists after getting a ref to it

2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush

2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation

2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation

2060795 - CVE-2022-0847 kernel: improper initialization of the "flags" member of the new pipe_buffer

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