CVE-2026-20809

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CVSS 3.1

7.8 high

EPSS

<1%p30

Published

Jan 13, 2026 (Jan 13, 2026)

Modified

Jul 30, 2026

Description

Time-of-check time-of-use (toctou) race condition in Windows Kernel Memory allows an authorized attacker to elevate privileges locally.

Vendors: microsoft
Products: windows 10 1607, windows 10 1809, windows 10 21h2, windows 10 22h2, windows 11 23h2, windows 11 24h2, windows 11 25h2, windows server 2012, windows server 2016, windows server 2019, windows server 2022, windows server 2022 23h2
Weakness: CWE-122, CWE-367
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.4%)

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