Oct 2026: Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
CVE-2026-97790 Published on October 13, 2026
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
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.
Weakness Type
What is an insecure temporary file Vulnerability?
The software attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
CVE-2026-97790 has been classified to as an insecure temporary file vulnerability or weakness.
Products Associated with CVE-2026-97790
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Affected Versions
Microsoft Windows 11 Version 24H2:- Version 10.0.26100.0 and below 10.0.26100.9711 is affected.
- Version 10.0.26200.0 and below 10.0.26200.9711 is affected.
- Version 10.0.28000.0 and below 10.0.28000.3231 is affected.
- Version 10.0.26300.0 and below 10.0.26300.9711 is affected.
- Version 10.0.20348.0 and below 10.0.20348.5761 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33650 is affected.
- Version 10.0.26100.0 and below 10.0.26100.33650 is affected.