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 only allow the use of DOD PKI-established certificate authorities for authentication in the establishment of protected sessions to the operating system.

DISA Rule

SV-269427r1050310_rule

Vulnerability Number

V-269427

Group Title

SRG-OS-000403-GPOS-00182

Rule Version

ALMA-09-041270

Severity

CAT II

CCI(s)

CCI-002470 - Only allow the use of organization-defined certificate authorities for verification of the establishment of protected sessions.

Weight

Fix Recommendation

Configure AlmaLinux OS 9 to only allow the use of DOD PKI-established certificate authorities.

For each untrusted CA, export the certificate to a file and add it to the blocklist:

$ trust dump --filter "pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert" > /etc/pki/ca-trust/source/blocklist/ISRGRootX2

$ update-ca-trust

Verify that the certificate is in the blocklist:

$ trust list --filter=blocklist
p11-kit: overriding trust for anchor in blocklist: ISRGRootX2
pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert
type: certificate
label: ISRG Root X2
trust: distrusted
category: authority

pkcs11:id=%88%68%BF%E0%8E%35%C4%3B%38%6B%62%F7%28%3B%84%81%C8%0C%D7%4D;type=cert
type: certificate
label: Explicitly Distrust DigiNotar Root CA
trust: distrusted
category: authority

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Verify AlmaLinux OS 9 only allows the use of DOD PKI-established certificate authorities using the following command:

$ trust list

pkcs11:id=%7C%42%96%AE%DE%4B%48%3B%FA%92%F8%9E%8C%CF%6D%8B%A9%72%37%95;type=cert
type: certificate
label: ISRG Root X2
trust: anchor
category: authority

If any nonapproved CAs are returned, this is a finding.

Vulnerability Number

V-269427

Documentable

False

Rule Version

ALMA-09-041270

Severity Override Guidance

Check Content Reference

Target Key

5664