VDB-322900 · CVE-2025-39692 · Nessus 261636

Linux Kernel up to 6.17-rc2 ksmbd_rdma_stop_listening null pointer dereference

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.148/6.6.102/6.12.43/6.16.3/6.17-rc2 and classified as critical. The affected element is the function ksmbd_rdma_stop_listening. Executing a manipulation can lead to null pointer dereference. This vulnerability is registered as CVE-2025-39692. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.148/6.6.102/6.12.43/6.16.3/6.17-rc2. It has been declared as critical. This vulnerability affects the function ksmbd_rdma_stop_listening. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: smb: server: split ksmbd_rdma_stop_listening() out of ksmbd_rdma_destroy() We can't call destroy_workqueue(smb_direct_wq); before stop_sessions()! Otherwise already existing connections try to use smb_direct_wq as a NULL pointer.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2025-39692 since 04/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 261636 (Linux Distros Unpatched Vulnerability : CVE-2025-39692), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.149, 6.6.103, 6.12.44, 6.16.4 or 6.17-rc3 eliminates this vulnerability. Applying the patch 524e90e58a267dad11e23351d9e4b1f941490976/212eb86f75b4d7b82f3d94aed95ba61103bccb93/003e6a3150299f681f34cb189aa068018cef6a45/e41e33400516702427603f8fbbec43c91ede09c0/bac7b996d42e458a94578f4227795a0d4deef6fa 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 (261636) and CERT Bund (WID-SEC-2025-1988). Once again VulDB remains the best source for vulnerability data.

Affected

Debian Linux
Google Cloud Platform
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
NetApp FAS
NetApp AFF
NetApp ActiveIQ Unified Manager
SUSE openSUSE
RESF Rocky Linux
Open Source Linux Kernel
Microsoft Azure
Dell Secure Connect Gateway
IBM QRadar SIEM
IBM Security Verify Access
Dell NetWorker

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒