Description of problem:
...i'm totally new to linux so don't trust my words fully.

the date on the bug says that it happened tomorrow!! so I can't really identify when it could have happened.
this Fedora installation is brand new, it has been done trhough booting a USB stick 
and the past hours had been spent installing applications.
SELinux is preventing gnome-shell from 'execute' accesses on the file 2F72756E2F676E6F6D652D696E697469616C2D73657475702F233331383636202864656C6574656429.

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

If you believe that gnome-shell should be allowed execute access on the 2F72756E2F676E6F6D652D696E697469616C2D73657475702F233331383636202864656C6574656429 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 'gnome-shell' --raw | audit2allow -M my-gnomeshell
# semodule -X 300 -i my-gnomeshell.pp

Additional Information:
Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:object_r:xdm_var_run_t:s0
Target Objects                2F72756E2F676E6F6D652D696E697469616C2D73657475702F
                              233331383636202864656C6574656429 [ file ]
Source                        gnome-shell
Source Path                   gnome-shell
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-259.fc26.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.11.8-300.fc26.x86_64 #1 SMP Thu
                              Jun 29 20:09:48 UTC 2017 x86_64 x86_64
Alert Count                   3
First Seen                    2017-11-09 01:49:13 CST
Last Seen                     2017-11-09 01:49:28 CST
Local ID                      666068fd-d582-4d10-8aff-949582f3bc3e

Raw Audit Messages
type=AVC msg=audit(1510163368.115:212): avc:  denied  { execute } for  pid=1462 comm="gst-plugin-scan" path=2F72756E2F676E6F6D652D696E697469616C2D73657475702F233331383636202864656C6574656429 dev="tmpfs" ino=31866 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:xdm_var_run_t:s0 tclass=file permissive=0


Hash: gnome-shell,xdm_t,xdm_var_run_t,file,execute

Version-Release number of selected component:
selinux-policy-3.13.1-259.fc26.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.1
hashmarkername: setroubleshoot
kernel:         4.11.8-300.fc26.x86_64
type:           libreport