SMB shares fail to mount or are read-only on RHEL 7.5

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Issue

Client CIFS mount stopped working after RHEL 7.5 update.
A SMB share can not be mounted on RHEL 7.5, but can on RHEL 7.4.
A SMB share is mounted read-only on RHEL 7.5, but is read/write on RHEL 7.4.

Environment

Red Hat Enterprise Linux 7.5
kernel-3.10.0-862.el7 and later
SMB or SMB2

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