CVE-2021-34866

This vulnerability allows local attackers to escalate privileges on
affected installations of Linux Kernel 5.14-rc3. An attacker must first
obtain the ability to execute low-privileged code on the target system in
order to exploit this vulnerability. The specific flaw exists within the
handling of eBPF programs. The issue results from the lack of proper
validation of user-supplied eBPF programs, which can result in a type
confusion condition. An attacker can leverage this vulnerability to
escalate privileges and execute arbitrary code in the context of the
kernel. Was ZDI-CAN-14689.