ZDI-23-696: Linux Kernel ksmbd Tree Connection NULL Pointer Dereference Denial-of-Service Vulnerability
First published: Wed May 17 2023(Updated: )
This vulnerability allows remote attackers to create a denial-of-service condition 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 handling of SMB2_TREE_CONNECT and SMB2_QUERY_INFO commands. The issue results from the lack of proper validation of a pointer prior to accessing it. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.
| Affected Software | Affected Version | How to fix |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this Linux Kernel vulnerability?
The vulnerability ID of this Linux Kernel vulnerability is ZDI-23-696.
What is the severity level of the ZDI-23-696 vulnerability?
The severity level of the ZDI-23-696 vulnerability is high (7).
How can remote attackers exploit the ZDI-23-696 vulnerability?
Remote attackers can create a denial-of-service condition on affected installations of Linux Kernel by exploiting the ZDI-23-696 vulnerability.
Do systems with ksmbd enabled have to be authenticated to be vulnerable to ZDI-23-696?
No, authentication is not required to exploit the ZDI-23-696 vulnerability, but only systems with ksmbd enabled are vulnerable.
Where can I find more information about the ZDI-23-696 vulnerability?
You can find more information about the ZDI-23-696 vulnerability at the following references: [ZDI-23-696](http://www.zerodayinitiative.com/advisories/ZDI-23-696/), [Linux Kernel Commit](https://github.com/torvalds/linux/commit/3ac00a2ab69b34189942afa9e862d5170cdcb018), [ZDI-CAN-20479](https://www.zerodayinitiative.com/advisories/ZDI-CAN-20479/).
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