Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows and Windows Server - CVE-2026-113865
Published: November 11, 2026
Vulnerability identifier: #VU164963
CSH Severity: Low
CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-113865
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges and execute code on the host in the security context of the virtual machine worker process.
The vulnerability exists due to a time-of-check time-of-use (TOCTOU) race condition in Windows Hyper-V when processing operations from a guest virtual machine. A local user can win the race condition from within a guest virtual machine to execute code on the host in the security context of the virtual machine worker process.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-113865
Install security update from vendor's website.
Microsoft Windows - addressed in versions 10 21H2 10.0.19044.7846, 10 22H2 10.0.19045.7846, 11 23H2 10.0.22631.7711, 11 24H2 10.0.26100.9911, 11 24H2 10.0.26100.9974, 11 25H2 10.0.26200.9911, 11 25H2 10.0.26200.9974, 11 26H1 10.0.28000.3501
Windows Server - addressed in versions 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822
Windows Server - addressed in versions 2022 10.0.20348.5870, 2025 10.0.26100.33730, 2025 10.0.26100.33822