CVE-2019-18198: Missing Release of Resource after Effective Lifetime

In the Linux kernel before 5.3.4, a reference count usage error in the fib6rulesuppress function in the fib6 suppression feature of net/ipv6/fib6rules.c, when handling the FIBLOOKUPNOREF flag, can be exploited by a local attacker to corrupt memory, aka CID-ca7a03c41753...