In pam/gkr-pam-module.c in GNOME Keyring before 3.27.2, the user’s password is kept in a session-child process spawned from the LightDM daemon. This can expose the credential in cleartext.
bugzilla.redhat.com/show_bug.cgi?id=1677288
gitlab.gnome.org/GNOME/gnome-keyring/tags/3.27.2