CVE-2025-39943: Linux Kernel

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.15.1, before 5.15.194 (fixed in 5.15.194); from 5.16, before 6.1.154 (fixed in 6.1.154); from 6.2, before 6.6.108 (fixed in 6.6.108); from 6.7, before 6.12.49 (fixed in 6.12.49); from 6.13, before 6.16.9 (fixed in 6.16.9); version 5.15 only; …

Published 2025-10-04. Last modified 2026-07-30.