STIGQter 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 clear the page allocator to prevent use-after-free attacks.

DISA Rule

SV-282621r1200843_rule

Vulnerability Number

V-282621

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000030

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure TOSS 5 to enable page poisoning with the following commands:

$ sudo grubby --update-kernel=ALL --args="page_poison=1"

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

GRUB_CMDLINE_LINUX="page_poison=1"

Check Contents

Verify GRUB 2 is configured to enable page poisoning to mitigate use-after-free vulnerabilities.

Check that the current GRUB 2 configuration has page poisoning enabled using the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'page_poison=1'

If any output is returned, this is a finding.

Vulnerability Number

V-282621

Documentable

False

Rule Version

TOSS-05-000030

Severity Override Guidance

Verify GRUB 2 is configured to enable page poisoning to mitigate use-after-free vulnerabilities.

Check that the current GRUB 2 configuration has page poisoning enabled using the following command:

$ sudo grubby --info=ALL | grep args | grep -v 'page_poison=1'

If any output is returned, this is a finding.

Check Content Reference

M

Target Key

5738