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Red Hat Enterprise Linux 8.4 Kernel-RT Important Escalation RHSA-2022:6991-01 CVE-2022-2588

red hat
Calendar Grey October 18, 2022
Dist Redhat Esm H88
Kernel-rt updates for Fedora bolster system integrity, rectifying critical vulnerabilities such as unauthorized access and data exposures.
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):
* A use-after-free in cls_route filter implementation may lead to privilege escalation (CVE-2022-2588)
* Information leak in the IPv6 implementation (CVE-2021-45485)
* Information leak in the IPv4 implementation (CVE-2021-45486)
* 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 RHEL-8.4.z12 source tree (BZ#2119160)
* using __this_cpu_add() in preemptible [00000000] - caller is __mod_memcg_lruvec_state+0x69/0x1c0 [None8.4.0.z] (BZ#2124454)

Topics%20covered

Topics Covered

security advisory information leak privilege escalation bug fix Red Hat Enterprise Linux important kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-45485 https://access.redhat.com/security/cve/CVE-2021-45486 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 EUS (v.8.4):
Source: kernel-rt-4.18.0-305.65.1.rt7.137.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-kvm-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-kvm-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v.8.4):
Source: kernel-rt-4.18.0-305.65.1.rt7.137.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.65.1.rt7.137.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:6991-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:6991
Issue date: 2022-10-18

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 information leak privilege escalation bug fix Red Hat Enterprise Linux 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

2039911 - CVE-2021-45485 kernel: information leak in the IPv6 implementation

2039914 - CVE-2021-45486 kernel: information leak in the IPv4 implementation

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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