Use-after-free in Windows and Windows Server - CVE-2026-57092
Published: July 17, 2026
Vulnerability identifier: #VU138135
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-57092
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to use-after-free in Windows VMSwitch when handling network-related requests from a guest virtual machine through the Hyper-V Virtual Switch. A remote user can send a specially crafted network-related request to escalate privileges.
Exploitation requires the ability to run code in a guest virtual machine, and successful exploitation can cross the guest virtual machine boundary to affect the host system.
How to mitigate CVE-2026-57092
Install security update from vendor's website.