# auditctl -w /etc/shadow -p w

# ausearch -m avc -ts recent
----
time->Fri Oct  5 13:17:06 2018
type=AVC msg=audit(1538770626.301:842): avc:  denied  { read } for  pid=13444 comm="setroubleshootd" name="Packages" dev="dm-1" ino=24903757 scontext=system_u:system_r:setroubleshootd_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:var_lib_t:s0 tclass=file permissive=0




SELinux is preventing ModemManager from using the dac_override capability.

*****  Plugin dac_override (91.4 confidence) suggests   **********************

If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system
Then turn on full auditing to get path information about the offending file and generate the error again.
Do

Turn on full auditing
# auditctl -w /etc/shadow -p w
Try to recreate AVC. Then execute
# ausearch -m avc -ts recent
If you see PATH record check ownership/permissions on file, and fix it,
otherwise report as a bugzilla.

*****  Plugin catchall (9.59 confidence) suggests   **************************

If you believe that ModemManager should have the dac_override capability 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:
# ausearch -c 'ModemManager' --raw | audit2allow -M my-ModemManager
# semodule -X 300 -i my-ModemManager.pp

Additional Information:
Source Context                system_u:system_r:modemmanager_t:s0
Target Context                system_u:system_r:modemmanager_t:s0
Target Objects                Unknown [ capability ]
Source                        ModemManager
Source Path                   ModemManager
Port                          <Unknown>
Host                          rn6.rent-a-nerd.local
Source RPM Packages           
Target RPM Packages           
Policy RPM                    <Unknown>
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     rn6.rent-a-nerd.local
Platform                      Linux rn6.rent-a-nerd.local 4.17.7-200.fc28.x86_64
                              #1 SMP Tue Jul 17 16:28:31 UTC 2018 x86_64 x86_64
Alert Count                   1
First Seen                    2018-07-27 20:31:03 PDT
Last Seen                     2018-07-27 20:31:03 PDT
Local ID                      06f38645-a741-4b61-957c-0f0e7d53c89b

Raw Audit Messages
type=AVC msg=audit(1532748663.473:974): avc:  denied  { dac_override } for  pid=3138 comm="ModemManager" capability=1  scontext=system_u:system_r:modemmanager_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=capability permissive=0


Hash: ModemManager,modemmanager_t,modemmanager_t,capability,dac_override