Very yes. They could reveal their location for starters, which could spoil a mission and put lives at risk, but if they use the same device on both this and the ships network, you risk compromising the ship’s network or even the Navy itself, giving our enemies all kinds of sensitive info.
We are in the midst of a world war being waged in cyberspace and the US is losing. Incidents like this are a genuine threat.
Or several trillion very small problems.