The following was filed automatically by setroubleshoot:

Summary:

SELinux is preventing modem-manager (ModemManager_t) "read" device_t.

Detailed Description:

SELinux denied access requested by modem-manager. It is not expected that this
access is required by modem-manager and this access may signal an intrusion
attempt. It is also possible that the specific version or configuration of the
application is causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Please file a bug
report (http://bugzilla.redhat.com/bugzilla/enter_bug.cgi) against this package.

Additional Information:

Source Context                system_u:system_r:ModemManager_t:s0-s0:c0.c1023
Target Context                unconfined_u:object_r:device_t:s0
Target Objects                \x2fdevices\x2fpci0000:00\x2f0000:00:1a.7\x2fusb1\
                              x2f1-2 [ file ]
Source                        modem-manager
Source Path                   /usr/sbin/modem-manager
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           ModemManager-0.2-3.20090707.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.26-4.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed)
                              2.6.31-0.122.rc5.git2.fc12.x86_64 #1 SMP Mon Aug 3
                              12:58:47 EDT 2009 x86_64 x86_64
Alert Count                   2
First Seen                    Sun 09 Aug 2009 01:06:19 PM PDT
Last Seen                     Sun 09 Aug 2009 01:06:19 PM PDT
Local ID                      6da9bdbc-65ae-4c95-a210-81c3ef5c2e7f
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1249848379.303:28352): avc:  denied  { read } for  pid=1234 comm="modem-manager" name="\x2fdevices\x2fpci0000:00\x2f0000:00:1a.7\x2fusb1\x2f1-2" dev=tmpfs ino=1049297 scontext=system_u:system_r:ModemManager_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:device_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1249848379.303:28352): avc:  denied  { open } for  pid=1234 comm="modem-manager" name="\x2fdevices\x2fpci0000:00\x2f0000:00:1a.7\x2fusb1\x2f1-2" dev=tmpfs ino=1049297 scontext=system_u:system_r:ModemManager_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:device_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1249848379.303:28352): arch=c000003e syscall=2 success=yes exit=0 a0=7fff7fadf0f0 a1=0 a2=1b6 a3=238 items=0 ppid=1 pid=1234 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="modem-manager" exe="/usr/sbin/modem-manager" subj=system_u:system_r:ModemManager_t:s0-s0:c0.c1023 key=(null)


audit2allow suggests:

#============= ModemManager_t ==============
allow ModemManager_t device_t:file { read open };