CVE-2026-97790
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 10.0.26100.9711, 10.0.26200.9711, 10.0.28000.3231, 10.0.26300.9711, 10.0.20348.5761, and 1 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- Microsoft Windows 11 Version 24H2
From 10.0.26100.0 · fixed in 10.0.26100.9711
- Microsoft Windows 11 Version 25H2
From 10.0.26200.0 · fixed in 10.0.26200.9711
- Microsoft Windows 11 version 26H1
From 10.0.28000.0 · fixed in 10.0.28000.3231
- Microsoft Windows 11 Version 26H2
From 10.0.26300.0 · fixed in 10.0.26300.9711
- Microsoft Windows Server 2022
From 10.0.20348.0 · fixed in 10.0.20348.5761
- Microsoft Windows Server 2025
From 10.0.26100.0 · fixed in 10.0.26100.33650
- Microsoft Windows Server 2025 (Server Core installation)
From 10.0.26100.0 · fixed in 10.0.26100.33650