To reproduce, install MuseScore through Flathub on Fedora 35 Workstation with MATE desktop, then attempt to open it.

SELinux is preventing gdb from read access on the chr_file renderD128.

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

If you believe that gdb should be allowed read access on the renderD128 chr_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 'gdb' --raw | audit2allow -M my-gdb

semodule -X 300 -i my-gdb.pp

Additional Information:
Source Context system_u:system_r:abrt_t:s0-s0:c0.c1023
Target Context system_u:object_r:dri_device_t:s0
Target Objects renderD128 [ chr_file ]
Source gdb
Source Path gdb
Port
Host tobfosl
Source RPM Packages
Target RPM Packages
SELinux Policy RPM selinux-policy-targeted-35.5-1.fc35.noarch
Local Policy RPM selinux-policy-targeted-35.5-1.fc35.noarch
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name tobfosl
Platform Linux tobfosl 5.14.17-301.fc35.x86_64 #1 SMP Mon
Nov 8 13:57:43 UTC 2021 x86_64 x86_64
Alert Count 30
First Seen 2021-11-18 09:55:03 AEDT
Last Seen 2021-11-18 10:07:33 AEDT
Local ID 573ece71-f7e4-46e3-a6d9-3fd7c6da6d2b

Raw Audit Messages
type=AVC msg=audit(1637190453.280:357): avc: denied { read } for pid=3313 comm="gdb" name="renderD128" dev="devtmpfs" ino=447 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:dri_device_t:s0 tclass=chr_file permissive=0

Hash: gdb,abrt_t,dri_device_t,chr_file,read