Oct 2026: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerab
CVE-2026-97787 Published on October 13, 2026
Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.
Weakness Type
What is a Race Condition Vulnerability?
The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.
CVE-2026-97787 has been classified to as a Race Condition vulnerability or weakness.
Products Associated with CVE-2026-97787
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Affected Versions
Microsoft Windows 11 version 23H2:- Version 10.0.22631.0 and below 10.0.22631.7652 is affected.
- Version 10.0.22631.0 and below 10.0.22631.7652 is affected.
- 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.