Improper Authentication Affecting kernel-rt-debug-modules-extra package, versions <0:4.18.0-372.9.1.rt7.166.el8
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUGMODULESEXTRA-2329254
- published 4 Jan 2022
- disclosed 12 Sep 2021
Introduced: 12 Sep 2021
CVE-2021-4197 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-debug-modules-extra to version 0:4.18.0-372.9.1.rt7.166.el8 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-modules-extra package and not the kernel-rt-debug-modules-extra package as distributed by Centos.
See How to fix? for Centos: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.
References
- https://access.redhat.com/security/cve/CVE-2021-4197
- https://access.redhat.com/errata/RHSA-2022:1975
- https://bugzilla.redhat.com/show_bug.cgi?id=2035652
- https://lore.kernel.org/lkml/20211209214707.805617-1-tj@kernel.org/T/
- https://security.netapp.com/advisory/ntap-20220602-0006/
- https://www.debian.org/security/2022/dsa-5127
- https://www.debian.org/security/2022/dsa-5173
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://lore.kernel.org/lkml/20211209214707.805617-1-tj%40kernel.org/T/