Description of problem:
Occurs on boot of a Fedora 19 live image built from current repositories. SEalert claims the label is wrong, but if so, it's nothing I did.
SELinux is preventing /usr/sbin/modem-manager from 'getattr' accesses on the file /etc/udev/udev.conf.

*****  Plugin restorecon (99.5 confidence) suggests  *************************

If you want to fix the label. 
/etc/udev/udev.conf default label should be etc_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /etc/udev/udev.conf

*****  Plugin catchall (1.49 confidence) suggests  ***************************

If you believe that modem-manager should be allowed getattr access on the udev.conf file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep modem-manager /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                system_u:system_r:modemmanager_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:net_conf_t:s0
Target Objects                /etc/udev/udev.conf [ file ]
Source                        modem-manager
Source Path                   /usr/sbin/modem-manager
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           ModemManager-0.6.0.0-3.fc19.x86_64
Target RPM Packages           systemd-198-7.fc19.x86_64
Policy RPM                    selinux-policy-3.12.1-22.fc19.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     (removed)
Platform                      Linux (removed) 3.9.0-0.rc3.git0.3.fc19.x86_64 #1
                              SMP Mon Mar 18 21:39:31 UTC 2013 x86_64 x86_64
Alert Count                   2
First Seen                    2013-03-19 19:39:23 EDT
Last Seen                     2013-03-19 19:39:23 EDT
Local ID                      c8403bbd-c62c-4818-8933-159ce54c0b8e

Raw Audit Messages
type=AVC msg=audit(1363736363.933:79): avc:  denied  { getattr } for  pid=743 comm="modem-manager" path="/etc/udev/udev.conf" dev="dm-0" ino=151532 scontext=system_u:system_r:modemmanager_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:net_conf_t:s0 tclass=file


type=SYSCALL msg=audit(1363736363.933:79): arch=x86_64 syscall=fstat success=yes exit=0 a0=1b a1=7fff51f5a110 a2=7fff51f5a110 a3=0 items=0 ppid=1 pid=743 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 ses=4294967295 tty=(none) comm=modem-manager exe=/usr/sbin/modem-manager subj=system_u:system_r:modemmanager_t:s0-s0:c0.c1023 key=(null)

Hash: modem-manager,modemmanager_t,net_conf_t,file,getattr

audit2allow

#============= modemmanager_t ==============
allow modemmanager_t net_conf_t:file getattr;

audit2allow -R
require {
	type modemmanager_t;
}

#============= modemmanager_t ==============
sysnet_read_config(modemmanager_t)


Additional info:
hashmarkername: setroubleshoot
kernel:         3.9.0-0.rc3.git0.3.fc19.x86_64
type:           libreport