In FreeBSD 12.1-STABLE before r352509, 11.3-STABLE before r352509, and 11.3-RELEASE before p9, an unprivileged local user can trigger a use-after-free situation due to improper checking in SCTP when an application tries to update an SCTP-AUTH shared key.
https://security.netapp.com/advisory/ntap-20200518-0007/
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:14.sctp.asc