Vulnerability record · CVE-2025-39943 · published 4 October 2025

CVE-2025-39943: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.26% · top 84.1% CWE-125 · Out-of-bounds read

7.1CVSS 3.1 base score

0.26%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

6References

30 Jul 2026Last modified by NVD

Description

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Linux Kernel Linux

References

Link	Tags
https://git.kernel.org/stable/c/5282491fc49d5614ac6ddcd012e5743eecb6a67c	Patch
https://git.kernel.org/stable/c/529b121b00a6ee3c88fb3c01b443b2b81f686d48	Patch
https://git.kernel.org/stable/c/773fddf976d282ef059c36c575ddb81567acd6bc	Patch
https://git.kernel.org/stable/c/8be498fcbd5b07272f560b45981d4b9e5a2ad885	Patch
https://git.kernel.org/stable/c/bdaab5c6538e250a9654127e688ecbbeb6f771d5	Patch
https://git.kernel.org/stable/c/eb0378dde086363046ed3d7db7f126fc3f76fd70	Patch

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-39943), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.