EUVD-2026-22535
GHSA-8w6v-5pwp-2m3f
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD.
CVSS VectorNVD
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6DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Function Discovery Service (fdwsd.dll) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Function Discovery Service (fdwsd.dll) allows low-privileged authenticated users to gain SYSTEM-level access via a race condition. Affects all supported Windows 10, 11, and Server versions from 2012 through 2025. Vendor-released patches available from Microsoft. CVSS 7.0 (high complexity local attack). No public exploit identified at time of analysis, though the race condition class (CWE-362) is well-understood and commonly weaponized once details emerge.
Technical ContextAI
The Function Discovery Service (fdwsd.dll) is a core Windows component responsible for network resource discovery and device enumeration. This vulnerability stems from CWE-362 (Race Condition), where concurrent operations on shared resources lack proper synchronization primitives. The service operates with elevated privileges, and the race window allows a low-privileged local user to manipulate shared resources between time-of-check and time-of-use (TOCTOU), achieving arbitrary code execution in the service's security context. The high attack complexity (AC:H) indicates precise timing or multiple exploitation attempts are required to win the race. Affected products span Windows 10 versions 1607 through 22H2 (builds 10.0.14393-19045), Windows 11 versions 22H3 through 26H1 (builds 10.0.22631-28000), and all Windows Server editions from 2012 (6.2.9200) through 2025 (10.0.26100), including Server Core installations.
RemediationAI
Apply Microsoft security updates immediately via Windows Update or WSUS. Patched versions are Windows 10 1607/Server 2016 build 10.0.14393.9060 or later, Windows 10 1809/Server 2019 build 10.0.17763.8644 or later, Windows 10 21H2 build 10.0.19044.7184 or later, Windows 10 22H2 build 10.0.19045.7184 or later, Windows 11 22H3/23H2 build 10.0.22631.6936 or later, Windows 11 24H2/Server 2025 build 10.0.26100.32690 or later, Windows 11 25H2 build 10.0.26200.8246 or later, Windows 11 26H1 build 10.0.28000.1836 or later, Server 2012 build 6.2.9200.26026 or later, Server 2012 R2 build 6.3.9600.23132 or later, and Server 2022 23H2 build 10.0.25398.2274 or later. No workarounds are documented; patching the vulnerable fdwsd.dll component is the only remediation. Consult the official advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32150 for deployment guidance and KB article numbers.
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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