Executive brief
Windows VOLSNAP.SYS is a core system driver that manages disk volume snapshots for backup and disaster recovery. A heap-based buffer overflow in this driver could allow an authenticated local user to execute arbitrary code with system-level privileges, potentially compromising the entire system and enabling unauthorized access to sensitive data.
Technical details
A heap-based buffer overflow vulnerability exists in the Windows VOLSNAP.SYS driver, a kernel-mode component responsible for volume snapshot management. The vulnerability requires local code execution context and an authenticated user account to exploit. An attacker can craft malicious input that triggers improper memory handling, overwriting heap memory and potentially achieving kernel-mode code execution. The attack vector is local (not network-accessible) and requires attacker privileges on the system. Microsoft has released a patch to address this issue.
Affected products
- Microsoft Windows <UNKNOWN>
Timeline
- 2026-09-08: disclosed