Improper Authentication Affecting kernel-core package, versions <0:4.18.0-372.9.1.el8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-RHEL8-KERNELCORE-4268292
  • published4 Jan 2022
  • disclosed12 Sept 2021

Introduced: 12 Sep 2021

CVE-2021-4197  (opens in a new tab)
CWE-287  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-core to version 0:4.18.0-372.9.1.el8 or higher.
This issue was patched in RHSA-2022:1988.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-core package and not the kernel-core package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

An unprivileged write to the file handler flaw in the Linux kernel's control groups and namespaces subsystem was found in the way users have access to some less privileged process that are controlled by cgroups and have higher privileged parent process. It is actually both for cgroup2 and cgroup1 versions of control groups. A local user could use this flaw to crash the system or escalate their privileges on the system.

CVSS Scores

version 3.1