SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
{
	struct task_struct *g, *p;
	struct user_struct *user;
	const struct cred *cred = current_cred();
	int error = -EINVAL;
	struct pid *pgrp;
	kuid_t uid;

	if (which > PRIO_USER || which < PRIO_PROCESS)
		goto out;

	/* normalize: avoid signed division (rounding problems) */
	error = -ESRCH;
	if (niceval < -20)
		niceval = -20;
	if (niceval > 19)
		niceval = 19;

	rcu_read_lock();
	read_lock(&tasklist_lock);
	switch (which) {
		case PRIO_PROCESS:
			if (who)
				p = find_task_by_vpid(who);
			else
				p = current;
			if (p)
				error = set_one_prio(p, niceval, error);
			break;
		case PRIO_PGRP:
			if (who)
				pgrp = find_vpid(who);
			else
				pgrp = task_pgrp(current);
			do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
				error = set_one_prio(p, niceval, error);
			} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
			break;
		case PRIO_USER:
			uid = make_kuid(cred->user_ns, who);
			user = cred->user;
			if (!who)
				uid = cred->uid;
			else if (!uid_eq(uid, cred->uid) &&
				 !(user = find_user(uid)))
				goto out_unlock;	/* No processes for this user */

			do_each_thread(g, p) {
				if (uid_eq(task_uid(p), uid))
					error = set_one_prio(p, niceval, error);
			} while_each_thread(g, p);
			if (!uid_eq(uid, cred->uid))
				free_uid(user);		/* For find_user() */
			break;
	}
out_unlock:
	read_unlock(&tasklist_lock);
	rcu_read_unlock();
out:
	return error;
}

This category covers vulnerabilities resulting from misconfigured system settings that can allow unintended access or insecure behavior due to improper management of configuration parameters.