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Exploiting Windows KTM Part 4/5

ID: b200cd30-55f5-5712-8f21-929e438ad399

STIX ID: report--b200cd30-55f5-5712-8f21-929e438ad399

Feed Name: NCC Research

Threat Score
75/100

Date Published: 2026-05-13

Date Updated: 2026-07-31

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This report details a kernel-level exploitation path in the Windows KTM subsystem: by crafting fake userland KENLISTMENT/KMUTANT structures and abusing the recovery thread in TmRecoverResourceManager(), the authors leak kernel pointers, create a Limited Write Primitive (an increment primitive via KeReleaseMutex/KiTryUnwaitThread), and combine it with an arbitrary kernel read (NtQueryInformationResourceManager) to perform a local privilege escalation to SYSTEM. The writeup explains required structure layouts, exploitation steps, limitations across Windows versions, and operational caveats (stability risks, performance), and demonstrates a proof-of-concept on an unpatched Windows 10 build.

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