ZDI-CAN-20481: ZDI-23-698: 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 SMB2SESSIONSETUP 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 Linux Kernel vulnerability?

The vulnerability ID for this Linux Kernel vulnerability is ZDI-CAN-20481.

What is the severity of ZDI-CAN-20481?

ZDI-CAN-20481 has a severity rating of critical with a value of 9.

How does the vulnerability in ZDI-CAN-20481 allow remote code execution?

The vulnerability in ZDI-CAN-20481 allows remote attackers to execute arbitrary code on affected installations of Linux Kernel.

Is authentication required to exploit ZDI-CAN-20481?

No, authentication is not required to exploit ZDI-CAN-20481.

Which systems are vulnerable to ZDI-CAN-20481?

Only systems with ksmbd enabled are vulnerable to ZDI-CAN-20481.