STIGQter: STIG Summary: Oracle Linux 8 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

OL 8 must clear the page allocator to prevent use-after-free attacks.

DISA Rule

SV-248590r958518_rule

Vulnerability Number

V-248590

Group Title

SRG-OS-000134-GPOS-00068

Rule Version

OL08-00-010421

Severity

CAT II

CCI(s)

CCI-001084 - Isolate security functions from nonsecurity functions.

Weight

Fix Recommendation

Configure OL 8 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 that GRUB 2 is configured to enable page poisoning to mitigate use-after-free vulnerabilities with the following commands:

$ sudo grub2-editenv list | grep page_poison

kernelopts=root=/dev/mapper/ol-root ro crashkernel=auto resume=/dev/mapper/ol-swap rd.lvm.lv=ol/root rd.lvm.lv=ol/swap rhgb quiet fips=1 page_poison=1 vsyscall=none audit=1 audit_backlog_limit=8192 boot=UUID=8d171156-cd61-421c-ba41-1c021ac29e82

If "page_poison" is not set to "1" or is missing, this is a finding.

Check that page poisoning is enabled by default to persist in kernel updates:

$ sudo grep page_poison /etc/default/grub

GRUB_CMDLINE_LINUX="page_poison=1"

If "page_poison" is not set to "1" or is missing or commented out, this is a finding.

Vulnerability Number

V-248590

Documentable

False

Rule Version

OL08-00-010421

Severity Override Guidance

Check Content Reference

Target Key

5416