STIGQter: STIG Summary: Cloud Linux AlmaLinux OS 9 Security Technical Implementation Guide Version: 1 Release: 7 Benchmark Date: 01 Jul 2026:

AlmaLinux OS 9 must restrict access to the kernel message buffer.

DISA Rule

SV-269425r1198253_rule

Vulnerability Number

V-269425

Group Title

SRG-OS-000132-GPOS-00067

Rule Version

ALMA-09-041050

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

Fix Recommendation

Configure AlmaLinux OS 9 to restrict access to the kernel message buffer with the following command:

$ echo "kernel.dmesg_restrict = 1 > /etc/sysctl.d/60-dmesg.conf"

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

$ sysctl --system

Check Contents

Verify AlmaLinux OS 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.

$ 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 that the configuration files are present to enable this kernel parameter.

$ /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F kernel.dmesg_restrict | tail -1

kernel.dmesg_restrict = 1

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

Vulnerability Number

V-269425

Documentable

False

Rule Version

ALMA-09-041050

Severity Override Guidance

Check Content Reference

Target Key

5664