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RHSA-2022:0819: Red Hat Security Advisory: kernel-rt security and bug fix update

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 impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

Related CVEs:

CVE-2021-0920: kernel: Use After Free in unix_gc() which could result in a local privilege escalation
CVE-2021-4154: kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout
CVE-2022-0330: kernel: possible privileges escalation due to missing TLB flush
CVE-2022-0435: kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS
CVE-2022-0492: kernel: cgroups v1 release_agent feature may allow privilege escalation
CVE-2022-0847: kernel: improper initialization of the “flags” member of the new pipe_buffer
CVE-2022-22942: kernel: failing usercopy allows for use-after-free exploitation

3 years ago

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Issued:

2022-03-10

Updated:

2022-03-10

RHSA-2022:0819 - Security Advisory

Overview
Updated Packages

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

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 impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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)

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.

Fixes

BZ - 2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation
BZ - 2034514 - CVE-2021-4154 kernel: local privilege escalation by exploiting the fsconfig syscall parameter leads to container breakout
BZ - 2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB flush
BZ - 2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation
BZ - 2048738 - CVE-2022-0435 kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS
BZ - 2051505 - CVE-2022-0492 kernel: cgroups v1 release_agent feature may allow privilege escalation
BZ - 2060795 - CVE-2022-0847 kernel: improper initialization of the “flags” member of the new pipe_buffer

CVEs