CVE-2026-97787 HIGH

CVE-2026-97787: Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows 11 version 23H2
Weakness CWE-362
Published October 13, 2026
Last update October 23, 2026
View on NVD All CVEs

CVSS base score

7.0/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 13, 2026 CVE published
October 23, 2026 Record updated

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