EUVD-2026-29624
GHSA-3wc2-mwpc-hr6w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged code triggers a kernel type confusion with no user interaction, yielding SYSTEM-level total compromise, so AV:L, PR:L, UI:N and C/I/A:H.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Articles & Coverage 1
AnalysisAI
Local privilege escalation in the Windows Win32K kernel-mode subsystem (ICOMP component) lets an already-authenticated low-privileged attacker gain SYSTEM-level control across a broad range of supported Windows client and server builds. The flaw is a type-confusion (CWE-843) memory-corruption issue reported by Microsoft; there is no public exploit identified at time of analysis and the EPSS probability is low (0.11%), but SSVC rates the technical impact as total. This is a standard Patch-Tuesday-class kernel EoP whose value is as the second stage of an intrusion after an attacker already has a foothold.
Technical ContextAI
Win32K (win32k.sys / win32kfull) is the kernel-mode component implementing the Windows GUI, window manager, and GDI subsystems, and it has long been one of the most heavily targeted local attack surfaces because it runs in ring 0 yet is reachable from low-privileged user sessions via syscalls. The affected 'ICOMP' area processes kernel objects, and the root cause is CWE-843 type confusion: code accesses a memory region as one object type when it is actually another. When an attacker forces this mismatch, the kernel operates on attacker-influenced fields (pointers, sizes, or dispatch data) as if they belonged to the expected type, producing controlled memory corruption that can be steered into arbitrary kernel read/write and token manipulation. The CPE and EUVD data confirm the vulnerable Win32K code ships with Windows 10 (1809, 21H2, 22H2), Windows 11 (22H3/23H2/24H2/25H2/26H1), and Windows Server 2019/2022/2022 23H2/2025, including Server Core installations.
RemediationAI
Apply the Microsoft cumulative security update for your specific OS build - this is the primary and only complete fix. Vendor-released patch: install the update that raises the OS to at least the fixed build for your edition, e.g. Windows 11 24H2 to 10.0.26100.8457, Windows 11 23H2/22H3 to 10.0.22631.7079, Windows 10 22H2 to 10.0.19045.7291, Windows Server 2025 to 10.0.26100.32860, and Windows Server 2019 to 10.0.17763.8755 (full build map in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-35417). Because exploitation requires a local low-privileged account, the strongest compensating control until patching is limiting who can run code on the host: enforce least privilege, remove unnecessary interactive/RDP logon rights, and restrict standard-user execution - the trade-off is potential disruption to legitimate user workflows. There is no vendor-documented feature-level workaround for a kernel type-confusion bug (you cannot cleanly disable Win32K on a GUI Windows host), so prioritized patch deployment is the actionable remediation; on multi-user/RDS servers treat this as higher urgency because any interactive user is a potential exploitation vector.
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External POC / Exploit Code
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