ZDI-CAN-31063: ZDI-26-573: Linux Kernel KSMBD Response Header Out-Of-Bounds Read Information Disclosure Vulnerability

Published Aug 13, 2026

Updated

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Linux Kernel KSMBD. Authentication is not required to exploit this vulnerability. However, only systems with ksmbd enabled are vulnerable. The ZDI has assigned a CVSS rating of 9.3. The following CVEs are assigned: CVE-2026-68431.

Affected Software

1 affected component

Linux kernel ksmbd

Event History

Aug 13, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-CAN-31063?

ZDI-CAN-31063 has a CVSS rating of 9.3, indicating a critical severity level.

How do I fix ZDI-CAN-31063?

To mitigate ZDI-CAN-31063, disable the ksmbd service if it is not required or apply relevant security patches provided by your Linux distribution.

Who can be affected by ZDI-CAN-31063?

Only systems with ksmbd enabled are vulnerable to ZDI-CAN-31063, allowing remote attackers to exploit the vulnerability.

What type of attack does ZDI-CAN-31063 enable?

ZDI-CAN-31063 enables remote attackers to disclose sensitive information, resulting in an information disclosure vulnerability.

Is authentication required to exploit ZDI-CAN-31063?

No, authentication is not required to exploit ZDI-CAN-31063, making it easier for attackers to target vulnerable systems.