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Linux Kernel: Update for IT security warning (risk: high)

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Linux Kernel: Update for IT security warning (risk: high)

An update to the IT security warning of a known vulnerability has been released for the Linux kernel. You can read a description of the security gap including the latest updates and information about affected operating systems and products here.

The Federal Office for Security in Information Technology (BSI) released an update on February 8th, 2024 for a security vulnerability for the Linux kernel that became known on October 14th, 2021. The security vulnerability affects the Linux operating system as well as the products Open Source Linux Kernel, Red Hat Enterprise Linux and SUSE Linux.

The latest manufacturer recommendations regarding updates, workarounds and security patches for this vulnerability can be found here: Red Hat Security Advisory RHSA-2024:0724 (As of February 7, 2024). Other useful resources are listed later in this article.

Linux Kernel Security Advisory – Risk: High

Risk level: 5 (high)
CVSS Base Score: 8,8
CVSS Temporal Score: 7,7
Remote attack: No

The Common Vulnerability Scoring System (CVSS) is used to assess the vulnerability of computer systems. The CVSS standard makes it possible to compare potential or actual security vulnerabilities based on various criteria in order to create a priority list for taking countermeasures. The attributes “none”, “low”, “medium”, “high” and “critical” are used to determine the severity levels of a vulnerability. The Base Score evaluates the requirements for an attack (including authentication, complexity, privileges, user interaction) and its consequences. With the temporal score, framework conditions that can change over time are taken into account in the evaluation. According to the CVSS, the threat of the current vulnerability is classified as “high” with a base score of 8.8.

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Linux Kernel Bug: Vulnerability allows privilege escalation

The kernel represents the core of the Linux operating system.

A local attacker can exploit a vulnerability in the Linux kernel to increase their privileges.

The vulnerability is identified with the unique CVE (Common Vulnerabilities and Exposures) identification number. CVE-2021-34866 traded.

Systems affected by the security gap at a glance

operating system

Open Source Linux Kernel Red Hat Enterprise Linux (cpe:/o:redhat:enterprise_linux)
SUSE Linux (cpe:/o:suse:suse_linux)

General recommendations for dealing with IT security gaps

Users of the affected systems should keep them up to date. When security gaps become known, manufacturers are required to fix them as quickly as possible by developing a patch or a workaround. If security patches are available, install them promptly. For information, consult the sources listed in the next section. These often contain further information about the latest version of the software in question as well as the availability of security patches or information about workarounds. If you have any further questions or uncertainties, please contact your responsible administrator. IT security managers should regularly check the sources mentioned to see whether a new security update is available.

Manufacturer information on updates, patches and workarounds

Here you will find further links with information about bug reports, security fixes and workarounds.

Red Hat Security Advisory RHSA-2024:0724 vom 2024-02-07 (08.02.2024)
For more information, see:

SUSE Security Update SUSE-SU-2021:3742-1 vom 2021-11-19 (22.11.2021)
For more information, see:

SUSE Security Update SUSE-SU-2021:3738-1 vom 2021-11-19 (22.11.2021)
For more information, see:

SUSE Security Update SUSE-SU-2021:3718-1 vom 2021-11-17 (18.11.2021)
For more information, see:

SUSE Security Update SUSE-SU-2021:3675-1 vom 2021-11-16 (17.11.2021)
For more information, see:

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SUSE Security Update SUSE-SU-2021:3655-1 vom 2021-11-11 (12.11.2021)
For more information, see:

SUSE Security Update SUSE-SU-2021:3641-1 vom 2021-11-09 (10.11.2021)
For more information, see:

SUSE Security Update SUSE-SU-2021:3642-1 vom 2021-11-09 (10.11.2021)
For more information, see:

Zero Day Initiative: ZDI-21-1148 vom 2021-10-13 (14.10.2021)
For more information, see:

Version history of this security alert

This is the 7th version of this IT security notice for Linux kernel. If further updates are announced, this text will be updated. You can see the changes made using the version history below.

October 14, 2021 – Initial version
November 10, 2021 – New updates from SUSE added
November 12, 2021 – New updates from SUSE added
November 17, 2021 – New updates from SUSE added
November 18, 2021 – New updates from SUSE added
November 22, 2021 – New updates from SUSE added
02/08/2024 – New updates from Red Hat added

+++ Editorial note: This text was generated based on current BSI data and will be updated in a data-driven manner depending on the warning situation. We accept feedback and comments at [email protected]. +++

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Edited by kns


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