Privilege escalation via Telephony Service race

Race condition in Windows Telephony Service in Microsoft Windows allows local users to gain elevated privileges via local access. Public records do not identify the specific function or object lifecycle, but Microsoft attributes the flaw to improper synchronization in Telephony Service and also maps a use-after-free condition, indicating a timing window around shared state or freed memory in the service. Exploitation requires local code execution with low privileges and high attack complexity; no public exploit artifact or authoritative in-the-wild exploitation record was cited in the Microsoft, NVD, GitHub, or CISA sources reviewed as of August 19, 2026.