SB2025102893 - Use-after-free in Linux kernel server mgmt
Published: October 28, 2025
Security Bulletin ID
SB2025102893
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2025-40039)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the ksmbd_session_rpc_open() and ksmbd_session_rpc_close() functions in fs/smb/server/mgmt/user_session.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.