EUVD-2026-44007
GHSA-6vcq-v59p-j58c
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker (AV:L/PR:L) must win a non-deterministic race (AC:H) with no user interaction, yielding full SYSTEM compromise (C:H/I:H/A:H) within the unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel-mode subsystem allows an authenticated low-privileged user to win a race condition and elevate to SYSTEM across Windows 10, Windows 11 (through 26H1), and Windows Server 2012 through 2025. Reported by Microsoft with a patch available, it carries CVSS 7.0 but a high attack complexity (AC:H) reflecting the timing-sensitive nature of the flaw. There is no public exploit identified at time of analysis, and EPSS is low (0.19%, 9th percentile), consistent with CISA SSVC rating exploitation as 'none.'
Technical ContextAI
Win32K is the Windows kernel-mode driver (win32k.sys and related graphics/window-management components) that handles the GUI subsystem, window messaging, and GDI operations; it has historically been a rich source of local privilege-escalation bugs because it runs at kernel privilege and is reachable from user-mode via syscalls. The root cause here is CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization, a 'race condition'): two or more threads access a shared kernel object without proper locking, creating a time-of-check-to-time-of-use window an attacker can exploit to corrupt kernel state. The affected CPE set spans Microsoft Windows client and server editions from Windows 10 1607 and Windows Server 2012 up through Windows 11 26H1 and Windows Server 2025, indicating the vulnerable code path is long-standing in the shared Win32K codebase.
RemediationAI
Apply the Microsoft security update for CVE-2026-54107 via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54107 (Patch available per vendor advisory); install the fixed cumulative build for your specific OS, for example 10.0.26100.8875 for Windows 11 24H2, 10.0.19045.7548 for Windows 10 22H2, 10.0.20348.5386 for Windows Server 2022, 10.0.17763.9020 for Windows 10 1809/Server 2019, 10.0.14393.9339 for 1607/Server 2016, 6.3.9600.23291 for Server 2012 R2, and 6.2.9200.26226 for Server 2012. Because this is a kernel driver flaw with no configuration toggle, there is no feature-level workaround; until patching, reduce risk by restricting interactive and low-privileged local logon rights on sensitive hosts (limiting who can run code to trigger the race), enforcing least privilege and application allowlisting to prevent untrusted binaries from executing, and monitoring EDR for anomalous SYSTEM-token acquisition - with the trade-off that these controls limit but do not eliminate the local attack surface. Prioritize legacy Server 2012/2012 R2 and any multi-user or terminal-server hosts where untrusted users hold local accounts.
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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