CVE-2021-34981

Published: 7 May 2024

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.

Notes

Priority reason:
CAP_NET_ADMIN privileges are required

to exploit this requires CAP_NET_ADMIN in the init namespace
(init_ns): cmtp_add_connection is called from do_cmtp_sock_ioctl,
with command CMTPCONNADD, which checks for capable(CAP_NET_ADMIN).

Status