SB2025092227 - NULL pointer dereference in Linux kernel smb client
Published: September 22, 2025
Security Bulletin ID
SB2025092227
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2025-39838)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the cifs_strndup_to_utf16() function in fs/smb/client/cifs_unicode.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1cfa5dd05847137f0fb3ce74ced80c0b4858d716
- https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260
- https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a
- https://git.kernel.org/stable/c/65b98a7e65e7a8f3894d8760cd194eaf20504c99
- https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0