STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must enable kernel parameters to enforce discretionary access control on hardlinks.

DISA Rule

SV-282553r1200639_rule

Vulnerability Number

V-282553

Group Title

SRG-OS-000312-GPOS-00123

Rule Version

TOSS-05-000102

Severity

CAT II

CCI(s)

• CCI-002165 - Enforce organization-defined discretionary access control policies over defined subjects and objects.
• CCI-002235 - Prevent non-privileged users from executing privileged functions.

Weight

10

Fix Recommendation

Configure TOSS 5 to enable DAC on hardlinks with the following:

Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:

fs.protected_hardlinks = 1

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

$ sudo sysctl --system

Check Contents

Verify TOSS 5 is configured to enable DAC on hardlinks using the following command:

$ sudo sysctl fs.protected_hardlinks

fs.protected_hardlinks = 1

If "fs.protected_hardlinks" is not set to "1" or is missing, this is a finding.

Vulnerability Number

V-282553

Documentable

False

Rule Version

TOSS-05-000102

Severity Override Guidance

Verify TOSS 5 is configured to enable DAC on hardlinks using the following command:

$ sudo sysctl fs.protected_hardlinks

fs.protected_hardlinks = 1

If "fs.protected_hardlinks" is not set to "1" or is missing, this is a finding.

Check Content Reference

M

Target Key

5738