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I see only 2 auto transitions to the showmount_t domain:
rhel88# sesearch -T -t showmount_exec_t -c process
type_transition automount_t showmount_exec_t:process showmount_t;
type_transition sysadm_t showmount_exec_t:process showmount_t;
So perhaps automount is required to be configured to trigger the denial?
An explicit transition seems to be unlikely.
SELinux status: enabled SELinuxfs mount: /sys/fs/selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: enforcing Mode from config file: enforcing Policy MLS status: enabled Policy deny_unknown status: allowed Memory protection checking: actual (secure) Max kernel policy version: 33 selinux-policy-3.14.3-108.el8.noarch ---- time->Fri Nov 11 08:46:33 2022 type=PROCTITLE msg=audit(1668152793.326:1167): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152793.326:1167): arch=c000003e syscall=21 success=no exit=-13 a0=7ffd468b26a0 a1=4 a2=8 a3=0 items=0 ppid=84633 pid=84634 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152793.326:1167): avc: denied { read } for pid=84634 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0 ---- time->Fri Nov 11 08:46:33 2022 type=PROCTITLE msg=audit(1668152793.435:1170): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152793.435:1170): arch=c000003e syscall=21 success=no exit=-13 a0=7ffd3f06ecf0 a1=4 a2=8 a3=0 items=0 ppid=84638 pid=84639 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152793.435:1170): avc: denied { read } for pid=84639 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0 ---- time->Fri Nov 11 08:46:33 2022 type=PROCTITLE msg=audit(1668152793.546:1173): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152793.546:1173): arch=c000003e syscall=21 success=no exit=-13 a0=7ffe6aee89d0 a1=4 a2=8 a3=0 items=0 ppid=84643 pid=84644 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152793.546:1173): avc: denied { read } for pid=84644 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0 ---- time->Fri Nov 11 08:49:05 2022 type=PROCTITLE msg=audit(1668152945.468:1564): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152945.468:1564): arch=c000003e syscall=21 success=no exit=-13 a0=7ffe45c270b0 a1=4 a2=8 a3=0 items=0 ppid=89391 pid=89392 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152945.468:1564): avc: denied { read } for pid=89392 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0 ---- time->Fri Nov 11 08:49:05 2022 type=PROCTITLE msg=audit(1668152945.589:1567): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152945.589:1567): arch=c000003e syscall=21 success=no exit=-13 a0=7ffcec024bc0 a1=4 a2=8 a3=0 items=0 ppid=89396 pid=89397 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152945.589:1567): avc: denied { read } for pid=89397 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0 ---- time->Fri Nov 11 08:49:05 2022 type=PROCTITLE msg=audit(1668152945.693:1570): proctitle=73686F776D6F756E74002D2D6578706F727473006C6F63616C686F7374 type=SYSCALL msg=audit(1668152945.693:1570): arch=c000003e syscall=21 success=no exit=-13 a0=7fff39b666e0 a1=4 a2=8 a3=0 items=0 ppid=89401 pid=89402 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="showmount" exe="/usr/sbin/showmount" subj=system_u:system_r:showmount_t:s0 key=(null) type=AVC msg=audit(1668152945.693:1570): avc: denied { read } for pid=89402 comm="showmount" name="unix" dev="proc" ino=4026532055 scontext=system_u:system_r:showmount_t:s0 tcontext=system_u:object_r:proc_net_t:s0 tclass=file permissive=0