STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 must restrict access to the kernel message buffer.

DISA Rule

SV-271745r1198253_rule

Vulnerability Number

V-271745

Group Title

SRG-OS-000132-GPOS-00067

Rule Version

OL09-00-002406

Severity

CAT II

CCI(s)

• CCI-001082 - Separate user functionality, including user interface services, from system management functionality.
• CCI-001090 - Prevent unauthorized and unintended information transfer via shared system resources.

Weight

10

Fix Recommendation

Configure OL 9 to restrict access to the kernel message buffer.

Add or edit the following line in /etc/sysctl.d/99-sysctl.conf system configuration file:

kernel.dmesg_restrict = 1

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

Check Contents

Verify that OL 9 is configured to restrict access to the kernel message buffer with the following commands:

Check the status of the kernel.dmesg_restrict kernel parameter.

$ sudo sysctl kernel.dmesg_restrict
kernel.dmesg_restrict = 1

If "kernel.dmesg_restrict" is not set to "1" or is missing, this is a finding.

Vulnerability Number

V-271745

Documentable

False

Rule Version

OL09-00-002406

Severity Override Guidance

Verify that OL 9 is configured to restrict access to the kernel message buffer with the following commands:

Check the status of the kernel.dmesg_restrict kernel parameter.

$ sudo sysctl kernel.dmesg_restrict
kernel.dmesg_restrict = 1

If "kernel.dmesg_restrict" is not set to "1" or is missing, this is a finding.

Check Content Reference

M

Target Key

5680