EUVD-2026-44124
GHSA-jp4g-rx9m-6v4h
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only race requiring an existing low-priv account gives AV:L/AC:H/PR:L; a successful SYSTEM-level win yields total C/I/A with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race condition (CWE-362) to gain SYSTEM-level rights across nearly all supported Windows client and server builds, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. Microsoft has shipped fixes and publicly available exploit code exists, though EPSS rates near-term mass exploitation modestly at 2.16% (80th percentile) and CISA's SSVC framework records no observed exploitation, indicating opportunistic rather than widespread abuse. The high AC:H reflects the timing-dependent nature of the flaw, which reduces reliability but does not eliminate risk on multi-user or shared hosts.
Technical ContextAI
The vulnerability lives in NTFS, the default on-disk file system driver (ntfs.sys) that underpins virtually every Windows installation and mediates all local file and metadata operations. The root cause is CWE-362, concurrent execution using a shared resource with improper synchronization - a race condition in which two threads operating on shared NTFS state are not correctly serialized, creating a time-of-check to time-of-use style window an attacker can exploit to corrupt or reuse kernel-managed resources. The affected CPE set (cpe:2.3:a:microsoft:windows_10_version_1607 through windows_11_version_26h1, plus windows_server_2012 and later) confirms the defect resides in the shared kernel-mode NTFS code common to both client and server SKUs, so any host that mounts an NTFS volume - effectively all of them - carries the vulnerable component.
RemediationAI
Apply the Microsoft security update for your specific build as the primary and complete fix - Vendor-released patch: install at minimum 10.0.14393.9339 (1607/Server 2016), 10.0.17763.9020 (1809/Server 2019), 10.0.19044.7548 (21H2), 10.0.19045.7548 (22H2), 10.0.26100.8875 (24H2)/10.0.26200.8875 (25H2), 10.0.28000.2525 (26H1), 10.0.20348.5386 (Server 2022), 10.0.26100.33158 (Server 2025), 6.2.9200.26226 (Server 2012), or 6.3.9600.23291 (Server 2012 R2), sourced from https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50667. Microsoft provides no dedicated pre-patch workaround for a kernel driver race, so where patching must be deferred the practical compensating controls are to restrict who can execute code on the host: remove untrusted or standard interactive accounts from shared and terminal-server systems, enforce least privilege and application allow-listing (e.g. WDAC/AppLocker) to block delivery of exploit binaries, and prioritize multi-user hosts first - the trade-off is that these controls only reduce the pool of potential attackers and do not close the underlying race, so patching remains mandatory.
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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