net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release.
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://github.com/Live-Hack-CVE/CVE-2019-20892