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 mitigations against processor-based vulnerabilities.

DISA Rule

SV-282473r1200399_rule

Vulnerability Number

V-282473

Group Title

SRG-OS-000095-GPOS-00049

Rule Version

TOSS-05-000032

Severity

CAT III

CCI(s)

• CCI-000381 - Configure the system to provide only organization-defined mission essential capabilities.
• CCI-002824 - Implement organization-defined controls to protect its memory from unauthorized code execution.

Weight

10

Fix Recommendation

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"

Check Contents

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.

Vulnerability Number

V-282473

Documentable

False

Rule Version

TOSS-05-000032

Severity Override Guidance

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.

Check Content Reference

M

Target Key

5738