CVE-2026-61929

Think of your computer’s kernel as the core engine that everything depends on. This bug happens when the system uses a piece of memory after it’s already been cleaned up, which can be abused by someone who already has a foothold on the machine to break out of normal permissions and take control.

This matters if your business runs Windows 11 or Windows Server 2025. Because this is a local privilege escalation with an authorized attacker requirement, it’s mainly a risk if an attacker can already get onto a device (for example via stolen credentials, malware, or another local foothold). Patch impact is therefore highest on machines that are reachable and regularly used by people, and where attackers could realistically obtain a local foothold.

This is RED because it’s a Windows kernel privilege escalation vulnerability that can turn an attacker’s local access into full control of the machine. Even though there’s no public exploit code recorded and it’s not listed in CISA KEV, Microsoft has already shipped fixes for multiple Windows branches, so you should prioritize patching immediately for impacted systems.