CVE-2026-70021: Windows Direct Composition Elevation of Privilege Vulnerability
Use after free in Windows Direct Composition allows an authorized attacker to elevate privileges locally.
Other sources
Windows Direct Composition Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655
Event History
Frequently Asked Questions
Who is exposed to this vulnerability?
Systems running the listed Microsoft Windows products are potentially exposed: Windows 11, Windows Server 2025, and Windows Server 2022. Exploitation requires local access by an authorized attacker.
What access does an attacker need to exploit it?
The attacker must already be authorized on the affected system and able to execute an attack locally. No user interaction is required, but the attack complexity is rated high.
What is the likely impact if exploitation succeeds?
Successful exploitation allows elevation of privilege. The supplied severity vector indicates high potential impact to confidentiality, integrity, and availability.
How can I determine whether a system is affected?
Identify whether the system runs Windows 11, Windows Server 2025, or Windows Server 2022, then consult the referenced Microsoft advisory for applicable update information. The provided data does not identify specific affected build or patch levels.