CVE-2026-97790
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering vulnerability
MSRC advisory October 13, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-97790
- Affected products
- Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering · Microsoft Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering · Microsoft
What happened
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.
What it means for your business
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering vulnerability (CVE-2026-97790) was added to Microsoft’s security update guidance. 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. If you need help checking exposure, call (864) 335-9223.
EPSS probability
0.36%
Sources
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