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CVE-2026-97790medium5.5

Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

Impact

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

Source excerpt · microsoft

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Microsoft · Windows 11 Version 24H2

Platforms: ARM64-based Systems, x64-based Systems

Version / rangeSource status
10.0.26100.0 to before 10.0.26100.9711affected
microsoft version evidence

Microsoft · Windows 11 Version 25H2

Platforms: ARM64-based Systems, x64-based Systems

Version / rangeSource status
10.0.26200.0 to before 10.0.26200.9711affected
microsoft version evidence

Microsoft · Windows 11 version 26H1

Platforms: ARM64-based Systems, x64-based Systems

Version / rangeSource status
10.0.28000.0 to before 10.0.28000.3231affected
microsoft version evidence

Microsoft · Windows 11 Version 26H2

Platforms: ARM64-based Systems, x64-based Systems

Version / rangeSource status
10.0.26300.0 to before 10.0.26300.9711affected
microsoft version evidence

Microsoft · Windows Server 2022

Platforms: x64-based Systems

Version / rangeSource status
10.0.20348.0 to before 10.0.20348.5761affected
microsoft version evidence

Microsoft · Windows Server 2025

Platforms: x64-based Systems

Version / rangeSource status
10.0.26100.0 to before 10.0.26100.33650affected
microsoft version evidence

Microsoft · Windows Server 2025 (Server Core installation)

Platforms: x64-based Systems

Version / rangeSource status
10.0.26100.0 to before 10.0.26100.33650affected
microsoft version evidence

Original source description

Improper link resolution before file access ('link following') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to perform tampering locally.

References