Executive brief
A security vulnerability exists in the Windows networking component (TCP/IP) that could allow a user with basic access to a computer to gain full administrative control. This flaw could be used by an attacker who has already gained a foothold on a system to bypass security restrictions and access sensitive data or install malicious software. The issue affects multiple versions of Windows 10, Windows 11, and Windows Server.
Technical details
This vulnerability is a use-after-free (UAF) flaw within the Windows TCP/IP stack, potentially triggered by an underlying integer overflow (CWE-190). An attacker must have local access and be authenticated with low privileges (PR:L) to exploit the flaw. By successfully triggering the memory corruption, the attacker can achieve local privilege escalation (LPE), gaining SYSTEM-level permissions. The vulnerability is reachable via local vectors and does not require user interaction. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.
Affected products
- Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 Versions 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 All editions including Server Core
Timeline
- 2026-07-14: disclosed: Initial disclosure by Microsoft and NVD.
- 2026-07-14: patched: Security updates made available by Microsoft.