DISA STIGS Viewer

Finding ID	Version	Rule ID	IA Controls	Severity
V-271735	OL09-00-002391	SV-271735r1091917_rule		Low

Description

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

STIG	Date
Oracle Linux 9 Security Technical Implementation Guide	2025-05-08

Check Text (C-75785r1091915_chk)

Verify that OL 9 enables kernel page-table isolation with the following command: $ sudo grubby --info=ALL | grep pti args="ro crashkernel=auto resume=/dev/mapper/ol-swap rd.lvm.lv=ol/root rd.lvm.lv=ol/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 that kernel page-table isolation is enabled by default to persist in kernel updates: $ sudo grep pti /etc/default/grub GRUB_CMDLINE_LINUX="pti=on" If "pti" is not set to "on", is missing or commented out, this is a finding.

Fix Text (F-75692r1091916_fix)

Configure OL 9 to enable kernel page-table isolation with 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"