CVE-2026-21224 Azure Connected Machine Agent Elevation of Privilege Vulnerability

High 7.8 Published 13 Jan 2026 Updated 30 Jul 2026

An authorized local attacker can exploit a stack-based buffer overflow in the Azure Connected Machine Agent to elevate privileges.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-21224?

CVE-2026-21224 is a high-severity memory corruption vulnerability in Microsoft Azure Connected Machine Agent, published on 13 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Stack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally.

Weakness: CWE-121

Which versions are affected by CVE-2026-21224?

It affects 1 product.

Products include Microsoft Azure Connected Machine Agent.

How do I fix CVE-2026-21224?

No fix has been published for CVE-2026-21224 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-21224 being exploited?

There is no known exploitation of CVE-2026-21224 in the wild and no public exploit code.

Sources

Also known as GHSA-9426-g97r-954q.