EUVD-2026-44011
GHSA-m3px-797p-vgfr
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged foothold required (AV:L/PR:L), timing-dependent race gives AC:H, and a successful win yields full SYSTEM compromise (C:H/I:H/A:H, scope unchanged).
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 already-authenticated attacker to win a race condition (CWE-362) and elevate to SYSTEM-level privileges across supported Windows 10, Windows 11, and Windows Server 2019-2025 builds. Reported by Microsoft with a vendor patch available; there is no public exploit identified at time of analysis and EPSS is low (0.16%, 5th percentile). CVSS 7.0 reflects high attack complexity (AC:H) driven by the timing-window nature of the flaw and the requirement for existing low-privilege access (PR:L).
Technical ContextAI
Win32K (win32k.sys / win32kfull.sys) is the Windows kernel-mode graphics and windowing subsystem that services GDI and USER syscalls from user mode; it has a long history of local privilege-escalation bugs because it runs at kernel privilege yet is directly reachable from any interactive process. This issue is a CWE-362 race condition: two or more threads access a shared kernel resource without proper synchronization, so an attacker who carefully times concurrent operations can manipulate object state (for example a use-after-free or state-confusion window) that the kernel assumes is stable. The affected CPEs are Microsoft OS builds only - Windows 10 (1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2019/2022/2025 including Server Core - confirming this is a core OS component rather than an optional feature.
RemediationAI
Apply the Microsoft security update that raises each affected build past its fixed version: 10.0.17763.9020 (1809 / Server 2019), 10.0.19044.7548 (21H2), 10.0.19045.7548 (22H2), 10.0.20348.5386 (Server 2022), 10.0.26100.8875 (Windows 11 24H2), 10.0.26200.8875 (25H2), 10.0.28000.2525 (26H1), and 10.0.26100.33158 (Server 2025 and Server 2025 Server Core); these ship through the normal cumulative-update channel referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54112. Because this is a Win32K kernel component with no configurable feature toggle, there is no clean product-level workaround, so patching is the only reliable fix. Until the update is deployed, reduce exposure by limiting who can execute code on the host - enforce least privilege, remove unnecessary interactive/local logon rights, and prioritize patching shared multi-user systems (RDS/terminal servers, jump boxes) where untrusted low-privileged users are most likely to be present; these controls limit the low-privileged foothold the exploit requires but do not remove the underlying flaw.
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Same weakness CWE-362 – Race Condition
View allSame technique Information Disclosure
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External POC / Exploit Code
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