Thanks for reporting this bug.  This appears to be a NULL dereference,
and does not seem exploitable.  I have unmarked it security/private.
Please feel free to report other bugs you may find.

$ ps auwwx | grep newgrp
root     23490  0.0  0.0  21900  1064 pts/13   S    14:09   0:00 newgrp testing
$ sudo gdb $(which newgrp) 23490
...
0x00002b81453ebb05 in waitpid () from /lib/libc.so.6
(gdb) cont
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0000000000402903 in ?? ()
(gdb) info reg
rax            0x0      0
...
(gdb) x/5i $pc
0x402903 <[EMAIL PROTECTED]>:   mov    (%rax),%r9


** Changed in: shadow (Ubuntu)
   Importance: Undecided => Low
       Status: New => Confirmed

** Visibility changed to: Public

** This bug is no longer flagged as a security issue

-- 
newgrp segfaults on exit when default group isn't in /etc/groups
https://bugs.launchpad.net/bugs/130205
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