CVE-2026-62788 is a use-after-free in the Windows kernel (23H2) enabling local privilege escalation to SYSTEM. Treat the CVSS 7 rating as a floor, not a ceiling — kernel UAFs give attackers kernel execution, which means HVCI, Secure Boot, and Credential Guard become interdependent failure points rather than sequential layers to defeat. The 'authorized attacker' qualifier is misleading: it means local access, but malware already runs as any user by default. The barrier isn't initial access — it's escalation from userland to kernel, and that's a much narrower window than the CVSS score implies.
The 23H2 timestamp is notable not because the code is new, but because it shipped with current toolchains and review processes. More likely than greenfield error is a refactor breaking an object lifecycle invariant — Windows kernel development has seen significant memory management interface refactoring. Check whether this UAF traces to new IOCTL handlers, callback registrations, or pooled allocation paths, because those are the seams where similar bugs cluster.
For defenders: prioritize patching this immediately, but also assume additional UAFs exist in adjacent code paths. The genealogical record shows Windows kernel UAFs clustering around the same interface boundaries for over a decade — IOCTL dispatch tables, callback registration into system pools, object manager reference paths. Each disclosed CVE in this class teaches attackers the pattern, making the next find easier. The real exposure isn't the window between patch release and installation — it's the gap between when this shipped and when external researchers with a decade of disclosed CVEs to learn from start fuzzing similar paths. Assume active exploitation development is already underway.