CVE-2026-102202: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.
Other sources
Windows Container Isolation FS Filter Driver (unionfs.sys) 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 10.0.22631.7652Patch KB5126653 - 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 10.0.20348.5761Patch KB5126655 - 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 10.0.26200.9711Patch 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 10.0.26100.9711Patch KB5127648
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
An attacker must already be authorized to access the affected system locally. The provided data does not indicate that remote access or user interaction is required.
What could a successful exploit allow?
A successful exploit could allow local elevation of privilege. The impact includes high confidentiality, integrity, and availability effects.
Which systems are identified as affected?
The listed affected software includes Microsoft Windows 11, Microsoft Windows Server 2022, Microsoft Windows Server 2025, and the Windows Container Isolation FS Filter Driver (unionfs.sys).