USN-6104-1: PostgreSQL vulnerabilities

Alexander Lakhin discovered that PostgreSQL incorrectly handled certain
CREATE privileges. An authenticated user could possibly use this issue to
execute arbitrary code as the bootstrap supervisor. (CVE-2023-2454)

Wolfgang Walther discovered that PostgreSQL incorrectly handled certain row
security policies. An authenticated user could possibly use this issue to
complete otherwise forbidden reads and modifications. (CVE-2023-2455)