TOSS 5 must prevent loading a new kernel for later execution.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282630 | TOSS-05-000100 | SV-282630r1200870_rule | CCI-000366 | medium |
| Description | ||||
| 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 subvert the entire secureboot process and should be avoided at all costs especially since it can load unsigned kernel images. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282630r1200870_chk)
Verify TOSS 5 is configured to disable kernel image loading using the following command:
$ 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.
Fix Text (F-87096r1200869_fix)
Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory:
kernel.kexec_load_disabled = 1
Load settings from all system configuration files using the following command:
$ sudo sysctl --system