Executive brief
Windows Overlay Filter is a core Windows component used to manage graphical overlay rendering in applications. A use-after-free vulnerability allows an authorized attacker to disclose sensitive information over the network by exploiting memory management flaws in the filter driver.
Technical details
This is a use-after-free vulnerability in the Windows Overlay Filter driver, a kernel-mode component responsible for managing graphical overlays in Windows. The vulnerability arises from improper memory lifecycle management that allows freed memory to be accessed, potentially leading to information disclosure. Attack precondition requires the attacker to already be authorized with network access; the vulnerability does not enable privilege escalation but can leak sensitive kernel or application memory contents over the network. Microsoft has released a security patch to address the issue.
Affected products
- Microsoft Windows Overlay Filter
Timeline
- 2026-09-08: disclosed