_ [debian] cifs-utils 2:4.5-1

mount.cifs が suid-root でなくなった件だけど、

mount.cifs: re-enable setuid usage

Now that mount.cifs is safe(r) we don't need to disable setuid capability by default.

ref. [linux-cifs-client] ANNOUNCE: cifs-utils release 4.2 available for download

4.2 で復活してたようだ。