Rear bumper for a vehicle

This application contains subject matter related to the following pending U.S. design patent applications filed herewith:

U.S. application Ser. No. 29/347,397;

U.S. application Ser. No. 29/347,403; and

U.S. application Ser. No. 29/347,401.

FIG. 1 is a left perspective view of a rear bumper for a vehicle according to my design;

FIG. 2 is a right perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design.