UCF STIG Viewer Logo

OL 8 must prevent the loading of a new kernel for later execution.


Finding ID Version Rule ID IA Controls Severity
V-248576 OL08-00-010372 SV-248576r877463_rule Medium
Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. Disabling "kexec_load" prevents an unsigned kernel image (that could be a windows kernel or modified vulnerable kernel) from being loaded. Kexec can be used to subvert the entire secureboot process and should be avoided at all costs, especially since it can load unsigned kernel images. The sysctl --system command will load settings from all system configuration files. All configuration files are sorted by their filename in lexicographic order, regardless of which of the directories they reside in. If multiple files specify the same option, the entry in the file with the lexicographically latest name will take precedence. Files are read from directories in the following list from top to bottom. Once a file of a given filename is loaded, any file of the same name in subsequent directories is ignored. /etc/sysctl.d/*.conf /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf
Oracle Linux 8 Security Technical Implementation Guide 2022-12-06


Check Text ( C-52010r858607_chk )
Verify the operating system is configured to disable kernel image loading with the following commands.

Check the status of the "kernel.kexec_load_disabled" kernel parameter:

$ sudo sysctl kernel.kexec_load_disabled

kernel.kexec_load_disabled = 1

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

Check that the configuration files are present to enable this kernel parameter:

$ sudo grep -r kernel.kexec_load_disabled /run/sysctl.d/*.conf /usr/local/lib/sysctl.d/*.conf /usr/lib/sysctl.d/*.conf /lib/sysctl.d/*.conf /etc/sysctl.conf /etc/sysctl.d/*.conf

/etc/sysctl.d/99-sysctl.conf:kernel.kexec_load_disabled = 1

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

If conflicting results are returned, this is a finding.
Fix Text (F-51964r858608_fix)
Configure OL 8 to disable kernel image loading.

Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:

kernel.kexec_load_disabled = 1

Remove any configurations that conflict with the above from the following locations:

Load settings from all system configuration files with the following command:

$ sudo sysctl --system