SELinux is preventing udisksd from read access on the blk_file sr0.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that udisksd should be allowed read access on the sr0 blk_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:
# ausearch -c 'udisksd' --raw | audit2allow -M my-udisksd
# semodule -X 300 -i my-udisksd.pp

Additional Information:
Source Context                system_u:system_r:udisks2_t:s0
Target Context                system_u:object_r:removable_device_t:s0
Target Objects                sr0 [ blk_file ]
Source                        udisksd
Source Path                   udisksd
Port                          <Unknown>
Host                          dragonfly.XXX.net
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-211.fc25.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     dragonfly.XXX.net
Platform                      Linux dragonfly.XXX.net
                              4.8.0-0.rc4.git0.1.fc25.x86_64 #1 SMP Mon Aug 29
                              19:28:01 UTC 2016 x86_64 x86_64
Alert Count                   14
First Seen                    2016-09-07 00:01:56 IDT
Last Seen                     2016-09-07 10:04:57 IDT
Local ID                      4702762b-d511-4d0a-9d46-ae092e9eef81

Raw Audit Messages
type=AVC msg=audit(1473231897.246:229): avc:  denied  { read } for  pid=1933 comm="udisksd" name="sr0" dev="devtmpfs" ino=10301 scontext=system_u:system_r:udisks2_t:s0 tcontext=system_u:object_r:removable_device_t:s0 tclass=blk_file permissive=0


Hash: udisksd,udisks2_t,removable_device_t,blk_file,read