CVE-2025-39838

Summary

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

Impact & exploitability

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

Affected products we track (2)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260Patch
• https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67aPatch
• https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0Patch
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlAdvisory
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html