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XCCDF
Guide to the Secure Configuration of Ubuntu 22.04
System Settings
Kernel Configuration
Disable kexec system call
Disable kexec system call
An XCCDF Rule
Details
Profiles
Prose
Disable kexec system call
Low Severity
kexec
is a system call that implements the ability to shutdown your current kernel, and to start another kernel. It is like a reboot but it is independent of the system firmware. And like a reboot you can start any kernel with it, not just Linux. The configuration that was used to build kernel is available at
/boot/config-*
. To check the configuration value for
CONFIG_KEXEC
, run the following command:
grep CONFIG_KEXEC /boot/config-*
Configs with value 'n' are not explicitly set in the file, so either commented lines or no lines should be returned.