Linux Kernel up to 5.15.144/6.1.27/6.2.14/6.3.1 ksmbd use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.15.144/6.1.27/6.2.14/6.3.1. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component ksmbd. This manipulation causes use after free. The identification of this vulnerability is CVE-2023-53358. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.144/6.1.27/6.2.14/6.3.1. It has been declared as critical. Affected by this vulnerability is an unknown function of the component ksmbd. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix racy issue under cocurrent smb2 tree disconnect There is UAF issue under cocurrent smb2 tree disconnect. This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent access.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2023-53358 since 09/17/2025. The exploitation appears to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/27/2025).

The vulnerability scanner Nessus provides a plugin with the ID 265624 (Linux Distros Unpatched Vulnerability : CVE-2023-53358), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.145, 6.1.28, 6.2.15 or 6.3.2 eliminates this vulnerability. Applying the patch b36295c17fb97424406f0c3ab321b1ccaabb9be8/bd80d35725a0cf4df9307bfe2f1a3b2cb983d8e6/dc1c17716c099c90948ebb83e2170dd75a3be6b6/39366b47a59d46af15ac57beb0996268bf911f6a/30210947a343b6b3ca13adc9bfc88e1543e16dd5 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265624) and CERT Bund (WID-SEC-2025-2087). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• IBM QRadar SIEM
• Open Source Linux Kernel
• RESF Rocky Linux
• Dell Secure Connect Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.15.144
• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.1.24
• 6.1.25
• 6.1.26
• 6.1.27
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.2.10
• 6.2.11
• 6.2.12
• 6.2.13
• 6.2.14
• 6.3.0
• 6.3.1

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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