dracut creates /dev/fb for plymouth with the mode 0644.
It should create /dev/fb0 with mode 0640 and symlink to /dev/fb.
fixed regression in bug 619153
symlink /dev/fb points to /dev/fb0 with 0660 mode and 'root' group membership. Is this mode acceptable? Supposed answer is 'yes', I just want to clarify that before moving to verified regarding to claimed mode in initial comment,
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.