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Red Hat: RHSA-2022-0819-01 Critical: kernel-rt Privilege Escalation

red hat
Calendar Grey March 10, 2022
Dist Redhat Esm H88
A significant kernel-rt patch for Red Hat rectifies various vulnerabilities, boosting overall system security and reliability.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8

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: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
* kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout (CVE-2021-4154)
* kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)
* kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)
* 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 symbol '__rt_mutex_init' is exported GPL-only in kernel 4.18.0-348.2.1.rt7.132.el8_5 (BZ#2038423)
* kernel-rt: update RT source tree to the RHEL-8.5.z3 source tree (BZ#2045589)

Topics%20covered

Topics Covered

security advisory security issue Red Hat local escalation important fix kernel-rt DoS mitigation

References

https://access.redhat.com/security/cve/CVE-2021-0920 https://access.redhat.com/security/cve/CVE-2021-4154 https://access.redhat.com/security/cve/CVE-2022-0330 https://access.redhat.com/security/cve/CVE-2022-0435 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 (v. 8):
Source: kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.src.rpm
x86_64: kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-kvm-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debuginfo-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-devel-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-kvm-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-modules-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-modules-extra-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 8):
Source: kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.src.rpm
x86_64: kernel-rt-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm kernel-rt-core-4.18.0-348.20.1.rt7.150.el8_5.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:0819-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:0819
Issue date: 2022-03-10

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.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 security issue Red Hat local escalation important fix kernel-rt DoS mitigation

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64

Red Hat Enterprise Linux for Real Time (v. 8) - x86_64

Bugs Fixed

2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation

2034514 - CVE-2021-4154 kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout

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

2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS

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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