SB2025082064 - NULL pointer dereference in Linux kernel smb server
Published: August 20, 2025 Updated: September 25, 2025
Security Bulletin ID
SB2025082064
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote 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-2025-38562)
The vulnerability allows a remote user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the krb5_authenticate() function in fs/smb/server/smb2pdu.c. A remote user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/015ef163d65496ae3ba6192c96140a22743f0353
- https://git.kernel.org/stable/c/2a30ed6428ce83afedca1a6c5c5c4247bcf12d0e
- https://git.kernel.org/stable/c/96a82e19434a2522525baab59c33332658bc7653
- https://git.kernel.org/stable/c/9b493ab6f35178afd8d619800df9071992f715de
- https://git.kernel.org/stable/c/9c2dbbc959e1fcc6f603a1a843e9cf743ba383bb
- https://git.kernel.org/stable/c/d79c8bebaa622ee223128be7c66d8aaeeb634a57
- https://www.zerodayinitiative.com/advisories/ZDI-25-917/