STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 must disable the chrony daemon from acting as a server.

DISA Rule

SV-257946r1184307_rule

Vulnerability Number

V-257946

Group Title

SRG-OS-000096-GPOS-00050

Rule Version

RHEL-09-252025

Severity

CAT III

CCI(s)

• CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.
• CCI-000382 - Configure the system to prohibit or restrict the use of organization-defined prohibited or restricted functions, system ports, protocols, software, and/or services.

Weight

10

Fix Recommendation

Configure RHEL 9 to disable the chrony daemon from acting as a server by adding/modifying the following line in the /etc/chrony.conf file:

port 0

Check Contents

Note: If the server is serving as an NTP server, this is not applicable.

Verify RHEL 9 disables the chrony daemon from acting as a server with the following command:

$ grep -w port /etc/chrony.conf

port 0

If the "port" option is not set to "0", is commented out, or is missing, this is a finding.

Vulnerability Number

V-257946

Documentable

False

Rule Version

RHEL-09-252025

Severity Override Guidance

Note: If the server is serving as an NTP server, this is not applicable.

Verify RHEL 9 disables the chrony daemon from acting as a server with the following command:

$ grep -w port /etc/chrony.conf

port 0

If the "port" option is not set to "0", is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5551