ZDI-CAN-20796: ZDI-23-706: Linux Kernel ksmbd Session Race Condition Remote Code Execution Vulnerability

Published May 17, 2023

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable. The specific flaw exists within the processing of SMB2LOGOFF and SMB2CLOSE commands. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to execute code in the context of the kernel.

Affected Software

1 affected component

Linux Kernel

Event History

May 17, 2023

Advisory Published

05:00 AM

Data Sourced

05:00 AM

Description

Feb 26, 2025

Advisory Published

via ZDI·03:45 PM

Frequently Asked Questions

What is the vulnerability ID for this vulnerability?

The vulnerability ID for this vulnerability is ZDI-CAN-20796.

What is the title of this vulnerability?

The title of this vulnerability is ZDI-23-706: Linux Kernel ksmbd Session Race Condition Remote Code Execution Vulnerability.

What is the severity of ZDI-CAN-20796?

The severity of ZDI-CAN-20796 is rated as high with a severity score of 8.1.

Which systems are affected by ZDI-CAN-20796?

Only systems with ksmbd enabled are affected by this vulnerability.

How can this vulnerability be exploited?

Remote attackers can exploit this vulnerability to execute arbitrary code on affected installations of Linux Kernel.