From Debian package 0.2.20100524-11

  * Allow snmpd to setuid and setgid.

Index: policy/modules/services/snmp.te
===================================================================
--- policy/modules/services/snmp.te.orig
+++ policy/modules/services/snmp.te
@@ -24,7 +24,7 @@
 #
 # Local policy
 #
-allow snmpd_t self:capability { chown dac_override kill ipc_lock sys_ptrace net_admin sys_nice sys_tty_config };
+allow snmpd_t self:capability { chown dac_override setgid setuid kill ipc_lock sys_ptrace net_admin sys_nice sys_tty_config };
 dontaudit snmpd_t self:capability { sys_module sys_tty_config };
 allow snmpd_t self:process { signal_perms getsched setsched };
 allow snmpd_t self:fifo_file rw_fifo_file_perms;