AlmaLinux OS 9 must be configured to disable USB mass storage.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-269357	SRG-OS-000095-GPOS-00049	ALMA-09-031370	SV-269357r1050240_rule	2025-05-22	1

Description
USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000378-GPOS-00163, SRG-OS-000114-GPOS-00059, SRG-OS-000690-GPOS-00140

ℹ️ Check
Verify that AlmaLinux OS 9 disables the ability to load the USB Storage kernel module with the following command: $ grep -r usb-storage /etc/modprobe.conf /etc/modprobe.d/* /etc/modprobe.d/usb-storage.conf:install usb-storage /bin/false /etc/modprobe.d/usb-storage.conf:blacklist usb-storage If the command does not return any output, or the line is commented out, and use of usb-storage is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

ℹ️ Check

Verify that AlmaLinux OS 9 disables the ability to load the USB Storage kernel module with the following command: $ grep -r usb-storage /etc/modprobe.conf /etc/modprobe.d/* /etc/modprobe.d/usb-storage.conf:install usb-storage /bin/false /etc/modprobe.d/usb-storage.conf:blacklist usb-storage If the command does not return any output, or the line is commented out, and use of usb-storage is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

✔️ Fix
To configure the system to prevent the usb-storage kernel module from being loaded, run the following command: $ cat << EOF \| tee /etc/modprobe.d/usb-storage.conf install usb-storage /bin/false blacklist usb-storage EOF