Windows NTFS EUVD-2026-73545

Exploitation requires an attacker to already have low-privileged, authenticated local code execution on the target Windows system (CVSS PR:L, AV:L). The high attack complexity (AC:H) indicates a race condition or specific kernel memory state must be achieved - exploitation is not reliable without a carefully timed sequence of NTFS I/O operations. No remote attack vector exists; no user interaction is required beyond the attacker's own actions. The limiting factors are: (1) attacker must already have a local low-privilege shell or RDP/interactive session, (2) the race window must be won, which typically requires repeated attempts and reduces automation reliability, and (3) kernel mitigations such as Kernel Control Flow Guard (kCFG) and HVCI (Hypervisor-Protected Code Integrity) on modern Windows 11 and Server 2022/2025 deployments may raise the exploitation bar further.

The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately characterizes this as a meaningful but non-trivial local privilege escalation. The local attack vector (AV:L) constrains exposure to systems where adversaries already have low-privileged code execution - a common post-initial-access step in enterprise intrusion chains rather than a direct initial-access primitive. The high complexity (AC:H) reflects a likely race condition, reducing reliable weaponization and distinguishing this from lower-barrier EoP bugs. Full C:H/I:H/A:H impact reflects that successful kernel exploitation yields SYSTEM-level control with unrestricted access. No public exploit code and no CISA KEV listing are identified at time of analysis, but given Windows ubiquity and the value of SYSTEM escalation in ransomware and APT kill chains, patching should be treated as high priority on internet-facing or multi-tenant Windows systems. EPSS data is not available in the provided intelligence.

An attacker with a foothold as a low-privileged domain or local user triggers a race condition in the Windows NTFS kernel driver - for example by issuing concurrent file operations that cause a kernel object to be freed while a reference remains live. By controlling the subsequently reclaimed memory region, the attacker redirects kernel execution flow and escalates their process token to SYSTEM, enabling full host takeover. No public exploit code has been identified at time of analysis.