CVE-2021-34981

Linux Kernel Bluetooth CMTP Module Double Free Privilege Escalation
Vulnerability. This vulnerability allows local attackers to escalate
privileges 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 CMTP module. The issue results from the lack of validating the
existence of an object prior to performing further free operations on the
object. An attacker can leverage this vulnerability to escalate privileges
and execute code in the context of the kernel. Was ZDI-CAN-11977.

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