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CVE-2025-39943
ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer
Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer If data_offset and data_length of smb_direct_data_transfer struct are invalid, out of bounds issue could happen. This patch validate data_offset and data_length field in recv_done.

INFO

Published Date :

Oct. 4, 2025, 8:15 a.m.

Last Modified :

Oct. 6, 2025, 2:56 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-39943 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Validate smb_direct_data_transfer fields to prevent out-of-bounds issues.
  • Validate data_offset and data_length in recv_done.
  • Update the Linux kernel to the latest version.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-39943.

URL Resource
https://git.kernel.org/stable/c/5282491fc49d5614ac6ddcd012e5743eecb6a67c
https://git.kernel.org/stable/c/529b121b00a6ee3c88fb3c01b443b2b81f686d48
https://git.kernel.org/stable/c/773fddf976d282ef059c36c575ddb81567acd6bc
https://git.kernel.org/stable/c/8be498fcbd5b07272f560b45981d4b9e5a2ad885
https://git.kernel.org/stable/c/bdaab5c6538e250a9654127e688ecbbeb6f771d5
https://git.kernel.org/stable/c/eb0378dde086363046ed3d7db7f126fc3f76fd70
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39943 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-39943 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-39943 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-39943 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Oct. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer If data_offset and data_length of smb_direct_data_transfer struct are invalid, out of bounds issue could happen. This patch validate data_offset and data_length field in recv_done.
    Added Reference https://git.kernel.org/stable/c/5282491fc49d5614ac6ddcd012e5743eecb6a67c
    Added Reference https://git.kernel.org/stable/c/529b121b00a6ee3c88fb3c01b443b2b81f686d48
    Added Reference https://git.kernel.org/stable/c/773fddf976d282ef059c36c575ddb81567acd6bc
    Added Reference https://git.kernel.org/stable/c/8be498fcbd5b07272f560b45981d4b9e5a2ad885
    Added Reference https://git.kernel.org/stable/c/bdaab5c6538e250a9654127e688ecbbeb6f771d5
    Added Reference https://git.kernel.org/stable/c/eb0378dde086363046ed3d7db7f126fc3f76fd70
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.