CVE-2025-39838
Unknown Unknown - Not Provided
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Publication date: 2025-09-19

Last updated on: 2025-11-03

Assigner: kernel.org

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
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Meta Information
Published
2025-09-19
Last Modified
2025-11-03
Generated
2026-06-16
AI Q&A
2025-09-19
EPSS Evaluated
2026-06-15
NVD
CVE-2025-39838
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel 6.1.153
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability is a NULL pointer dereference bug in the Linux kernel's CIFS component during UTF16 conversion. Specifically, a NULL value is passed without proper checks through several functions (__cifs_sfu_make_node, cifs_strndup_to_utf16, and cifs_local_to_utf16_bytes), leading to dereferencing a NULL pointer and causing a crash. The fix involves adding a check for NULL input to prevent this dereference.

Impact Analysis

This vulnerability can cause the Linux kernel to crash due to a NULL pointer dereference when handling certain CIFS operations involving UTF16 conversion. This crash can lead to denial of service by making the system unstable or unavailable.

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