In the Linux kernel before 5.0.6, there is a NULL pointer dereference in drop_sysctl_table() in fs/proc/proc_sysctl.c, related to put_links, aka CID-23da9588037e. CREATE(Triage):(User=admin) CVE-2019-20054 (https://nvd.nist.gov/vuln/detail/CVE-2019-20054)