Microsoft Windows win32kfull Out-Of-Bounds Write Local Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the win32kfull driver. The issue results from the lack of proper validation of user-supplied data, which can result in a write before the start of an allocated array. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM.
Additional Details
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49732
Disclosure Timeline
- 2025-04-04 - Vulnerability reported to vendor
- 2025-07-08 - Coordinated public release of advisory
- 2025-07-08 - Advisory Updated
Credit
Marcin Wiazowski
