WordPress at a glance
action is not described

check_admin_referer action-hook . WP 1.5.1

Fires once the admin request has been validated or not.

Usage

add_action( 'check_admin_referer', 'action_function_name_4568', 10, 2 );
function action_function_name_4568( $action, $result ){
	// action...
}
$action(string)
The nonce action.
$result(false/int)
False if the nonce is invalid, 1 if the nonce is valid and generated between
0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.

Where the hook is called

check_admin_referer()
wp-includes/pluggable.php 1102
do_action( 'check_admin_referer', $action, $result );

Where the hook is used (in WP core)

Does not used.