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

Successful/unsuccessful uses of the umount system call in TOSS 5 must generate an audit record.

DISA Rule

SV-282422r1201567_rule

Vulnerability Number

V-282422

Group Title

SRG-OS-000037-GPOS-00015

Rule Version

TOSS-05-000450

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

10

Fix Recommendation

Configure the audit system to generate an audit event for any successful/unsuccessful use of the "umount" system call by adding or updating the following rules in "/etc/audit/audit.rules" and adding the following rules to "/etc/audit/rules.d/perm_mod.rules" or updating the existing rules in files in the "/etc/audit/rules.d/" directory:

-a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount

Restart the audit daemon for changes to take effect.

Check Contents

Verify that TOSS 5 generates an audit record for all uses of the "umount" and system call with the following command:

$ sudo grep "umount" /etc/audit/audit.*

-a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount

If the command does not return a line or the line is commented out, this is a finding.

Vulnerability Number

V-282422

Documentable

False

Rule Version

TOSS-05-000450

Severity Override Guidance

Verify that TOSS 5 generates an audit record for all uses of the "umount" and system call with the following command:

$ sudo grep "umount" /etc/audit/audit.*

-a always,exit -F arch=b32 -S umount -F auid>=1000 -F auid!=unset -k privileged-umount

If the command does not return a line or the line is commented out, this is a finding.

Check Content Reference

M

Target Key

5738