SYSCALL_DEFINE1(setfsuid, uid_t, uid)
{
	const struct cred *old;
	struct cred *new;
	uid_t old_fsuid;
	kuid_t kuid;

	old = current_cred();
	old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);

	kuid = make_kuid(old->user_ns, uid);
	if (!uid_valid(kuid))
		return old_fsuid;

	new = prepare_creds();
	if (!new)
		return old_fsuid;

	if (uid_eq(kuid, old->uid)  || uid_eq(kuid, old->euid)  ||
	    uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
	    nsown_capable(CAP_SETUID)) {
		if (!uid_eq(kuid, old->fsuid)) {
			new->fsuid = kuid;
			if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
				goto change_okay;
		}
	}

	abort_creds(new);
	return old_fsuid;

change_okay:
	commit_creds(new);
	return old_fsuid;
}

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