CVE-2025-39838

MEDIUM

MEDIUM Priority: 0.01 BB Relevance: 36/100

Published: 2025-09-19 Modified: 2026-11-05 First seen: 2026-11-05 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local

AC: Low

PR: Low

UI: None

S: Unchanged

C: None

I: None

A: High

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL pointer dereference in UTF16 conversion There can be a NULL pointer dereference bug here. NULL is passed to __cifs_sfu_make_node without checks, which passes it unchecked to cifs_strndup_to_utf16, which in turn passes it to cifs_local_to_utf16_bytes where '*from' is dereferenced, causing a crash. This patch adds a check for NULL 'src' in cifs_strndup_to_utf16 and returns NULL early to prevent dereferencing NULL pointer. Found by Linux Verification Center (linuxtesting.org) with SVACE

Weakness Classification (1)

CWE-476

Affected Software (10)

Vendor	Product	Version
Linux	Linux	41d3f256c6a5e41eb32b87168399c0facd512dc0 < 1f797f062b5cf13a1c2bcc23285361baaa7c9260
Linux	Linux	41d3f256c6a5e41eb32b87168399c0facd512dc0 < 3c26a8d30ed6b53a52a023ec537dc50a6d34a67a
Linux	Linux	41d3f256c6a5e41eb32b87168399c0facd512dc0 < 70bccd9855dae56942f2b18a08ba137bb54093a0
Linux	Linux	6.12
debian	debian_linux	11.0
linux	linux_kernel	6.12 – 6.12.46
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17
linux	linux_kernel	6.17