A reference count issue was found in the Linux kernel's netdevsim device driver. Quoting ZDI security advisory [1]:

"This vulnerability allows local attackers to create a denial-of-service condition on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the scheduling of events. The issue results from the improper management of a reference count. An attacker can leverage this vulnerability to create a denial-of-service condition on the system."

[1] https://www.zerodayinitiative.com/advisories/ZDI-CAN-17811/