CVE-2026-102202: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
Published Oct 13, 2026
·Updated
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
27 affected componentsFixes available
Microsoft Windows Container Isolation FS Filter Driver (unionfs.sys)
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2022<10.0.20348.5761
10.0.20348.5761
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows Server 2025<10.0.26100.33650
10.0.26100.33650
Microsoft Windows 11 23h2<10.0.22631.7652
Microsoft Windows 11 23h2<10.0.22631.7652
Microsoft Windows 11 24h2<10.0.26100.9711
Microsoft Windows 11 24h2<10.0.26100.9711
Microsoft Windows 11 25h2<10.0.26200.9711
Microsoft Windows 11 25h2<10.0.26200.9711
Microsoft Windows 11 26h1<10.0.28000.3231
Microsoft Windows 11 26h1<10.0.28000.3231
Microsoft Windows 11 26h2<10.0.26300.9711
Microsoft Windows 11 26h2<10.0.26300.9711
Microsoft Windows Server 2022<10.0.20348.5761
Microsoft Windows Server 2025<10.0.26100.33650
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows 11=23H2, >=10.0.22631<10.0.22631.7652
10.0.22631.7652
Microsoft Windows 11=26H2, >=10.0.26300<10.0.26300.9711
10.0.26300.9711
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows 11=26H1, >=10.0.28000<10.0.28000.3231
10.0.28000.3231
Microsoft Windows 11=24H2, >=10.0.26100<10.0.26100.9711
10.0.26100.9711
Microsoft Windows 11=25H2, >=10.0.26200<10.0.26200.9711
10.0.26200.9711
Remediation
Event History
Oct 13, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·07:01 PM
Data Sourced
via MITRE·07:01 PM
DescriptionSeverity
Data Sourced
via NVD·07:17 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
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.
2
What could a successful exploit allow?
A successful exploit could allow local elevation of privilege. The impact includes high confidentiality, integrity, and availability effects.
3
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).