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Linux RHEL-10-701000

DISA STIG RHEL-10-701000 (CAT II): RHEL 10 must clear the page allocator to prevent use-after-free attacks.

DISA STIG recommends

RHEL-10-701000 CAT II

RHEL 10 must clear the page allocator to prevent use-after-free attacks.

NIST SP 800-53: SC-3

Check

Verify RHEL 10 is configured so that the current GRUB 2 configuration enables page poisoning to mitigate use-after-free vulnerabilities. Check that the current GRUB 2 configuration has page poisoning enabled with the following command: $ sudo grubby --info=ALL | grep args | grep -v 'page_poison=1' If any output is returned, this is a finding. Check that page poisoning is enabled by default to persist in kernel updates with the following command: $ sudo grep page_poison /etc/default/grub GRUB_CMDLINE_LINUX="page_poison=1" If "page_poison" is not set to "1", is missing or commented out, this is a finding.

Fix

Configure RHEL 10 to enable page poisoning with the following commands: $ sudo grubby --update-kernel=ALL --args="page_poison=1"

Our decision

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