Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

The Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide (V1 R2) has 391 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

Find STIG checks

391STIG checks

Search filters this STIG's checks locally. Separate terms must all match (use quotes for an exact phrase). A search you ran on the Search page carries over here.

Severity

Version

V1 · R2

CurrentPublished Wed Sep 30 2026

TOSS 5 must enable mitigations against processor-based vulnerabilities.

Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide

Assessment Title

Rule Text

TOSS 5 must enable mitigations against processor-based vulnerabilities.

Description

Discussion Text

Kernel page-table isolation is a kernel feature that mitigates the Meltdown security vulnerability and hardens the kernel against attempts to bypass kernel address space layout randomization (KASLR).

Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000433-GPOS-00193

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-282473

Rule

SV-282473r1200399_rule

Severity

low

Rule Version

TOSS-05-000032

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Verify TOSS 5 enables kernel page-table isolation using the following command:

$ sudo grubby --info=ALL | grep pti

args="ro crashkernel=auto resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet fips=1 audit=1 audit_backlog_limit=8192 pti=on 

If the "pti" entry does not equal "on" or is missing, this is a finding.

Implementation Procedure

Fix Text

Configure TOSS 5 to enable kernel page-table isolation using the following command:

$ sudo grubby --update-kernel=ALL --args="pti=on"

Add or modify the following line in "/etc/default/grub" to ensure the configuration survives kernel updates:

GRUB_CMDLINE_LINUX="pti=on"

STIG check 120 of 391 in the Tri-Lab Operating System Stack (TOSS) 5 STIG checklist

← Previous · V-282472TOSS 5 must require authentication to access single-user mode.Next · V-282474 →TOSS 5 must be configured to disable the Asynchronous Transfer Mode (ATM) kernel module.