STIGQter: STIG Summary: Red Hat Enterprise Linux 8 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

RHEL 8 must enable mitigations against processor-based vulnerabilities.

DISA Rule

SV-230491r627750_rule

Vulnerability Number

V-230491

Group Title

SRG-OS-000095-GPOS-00049

Rule Version

RHEL-08-040004

Severity

CAT III

CCI(s)

• CCI-000381 - The organization configures the information system to provide only essential capabilities.

Weight

10

Fix Recommendation

Configure RHEL 8 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"

Check Contents

Verify RHEL 8 enables kernel page-table isolation with the following commands:

$ sudo grub2-editenv - list | grep pti

kernelopts=root=/dev/mapper/rhel-root 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 boot=UUID=8d171156-cd61-421c-ba41-1c021ac29e82

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

Check that kernel page-table isolation is enabled by default to persist in kernel updates:

$ sudo grep audit /etc/default/grub

GRUB_CMDLINE_LINUX="pti=on"

If "pti" is not set to "on", is missing or commented out, this is a finding.

Vulnerability Number

V-230491

Documentable

False

Rule Version

RHEL-08-040004

Severity Override Guidance

Verify RHEL 8 enables kernel page-table isolation with the following commands:

$ sudo grub2-editenv - list | grep pti

kernelopts=root=/dev/mapper/rhel-root 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 boot=UUID=8d171156-cd61-421c-ba41-1c021ac29e82

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

Check that kernel page-table isolation is enabled by default to persist in kernel updates:

$ sudo grep audit /etc/default/grub

GRUB_CMDLINE_LINUX="pti=on"

If "pti" is not set to "on", is missing or commented out, this is a finding.

Check Content Reference

M

Target Key

2921

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