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 audit all uses of umount system calls.

DISA Rule

SV-282391r1201505_rule

Vulnerability Number

V-282391

Group Title

SRG-OS-000037-GPOS-00015

Rule Version

TOSS-05-000415

Severity

CAT II

CCI(s)

CCI-000130 - Ensure that audit records containing information that establishes what type of event occurred.
CCI-000169 - Provide audit record generation capability for the event types the system is capable of auditing as defined in AU-2 a. on organization-defined information system components.
CCI-002884 - Log organization-defined audit events for nonlocal maintenance and diagnostic sessions.
CCI-000172 - Generate audit records for the event types defined in AU-2 c that include the audit record content defined in AU-3.

Weight

Fix Recommendation

Configure TOSS 5 to generate audit records upon successful/unsuccessful attempts to use the "umount" command by adding or updating the following rules in "/etc/audit/rules.d/audit.rules":

-a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount

Restart the audit daemon for changes to take effect.

Check Contents

Verify that TOSS 5 is configured to audit the execution of the "umount" command with the following command:

$ sudo auditctl -l | grep umount

-a always,exit -F path=/usr/bin/umount -F perm=x -F auid>=1000 -F auid!=unset -k privileged-mount

If the command does not return an audit rule for "umount" or any of the lines returned are commented out, this is a finding.

Vulnerability Number

V-282391

Documentable

False

Rule Version

TOSS-05-000415

Severity Override Guidance

Check Content Reference

Target Key

5738