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CVE-2026-97790— Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability

Quick assessment

Affected
Microsoft Windows 11 Version 24H2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Windows 容器隔离文件系统过滤器驱动程序（unionfs.sys）中，在文件访问之前对链接的解析不当（即“链接跟踪”）存在漏洞，允许经授权的攻击者在本地实施篡改。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1546.010 · AppInit DLLs

Affected Version Matrix 7

VendorProduct Version RangeStatus
Microsoft Windows 11 Version 24H2 10.0.26100.0< 10.0.26100.9711 affected
Microsoft Windows 11 Version 25H2 10.0.26200.0< 10.0.26200.9711 affected
Microsoft Windows 11 version 26H1 10.0.28000.0< 10.0.28000.3231 affected
Microsoft Windows 11 Version 26H2 10.0.26300.0< 10.0.26300.9711 affected
Microsoft Windows Server 2022 10.0.20348.0< 10.0.20348.5761 affected
Microsoft Windows Server 2025 10.0.26100.0< 10.0.26100.33650 affected
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0< 10.0.26100.33650 affected
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I. Basic Information for CVE-2026-97790

Vulnerability Information
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Vulnerability Title
Windows Container Isolation FS Filter Driver (unionfs.sys) Tampering Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows 11 Version 24H2 10.0.26100.0 ~ 10.0.26100.9711 -
Microsoft Windows 11 Version 25H2 10.0.26200.0 ~ 10.0.26200.9711 -
Microsoft Windows 11 version 26H1 10.0.28000.0 ~ 10.0.28000.3231 -
Microsoft Windows 11 Version 26H2 10.0.26300.0 ~ 10.0.26300.9711 -
Microsoft Windows Server 2022 10.0.20348.0 ~ 10.0.20348.5761 -
Microsoft Windows Server 2025 10.0.26100.0 ~ 10.0.26100.33650 -
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 ~ 10.0.26100.33650 -

II. Public POCs for CVE-2026-97790

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III. Intelligence Information for CVE-2026-97790

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Vendor Advisories for CVE-2026-97790 (1)

Same Patch Batch · Microsoft · 2026-10-13 · 1407 CVEs total

CVE-2026-70096 9.8 CRITICAL Windows Rich Text Edit Control Remote Code Execution Vulnerability
CVE-2026-83862 9.8 CRITICAL Windows Network Load Balancing Remote Code Execution Vulnerability
CVE-2026-100219 9.8 CRITICAL Microsoft QUIC Remote Code Execution Vulnerability
CVE-2026-96909 9.8 CRITICAL Windows BitLocker Remote Code Execution Vulnerability
CVE-2026-83935 9.8 CRITICAL Microsoft XML Remote Code Execution Vulnerability
CVE-2026-83782 9.8 CRITICAL Windows Shell Remote Code Execution Vulnerability
CVE-2026-88102 9.8 CRITICAL Microsoft Failover Cluster Remote Code Execution Vulnerability
CVE-2026-83780 9.8 CRITICAL Windows CCFFilter Driver Remote Code Execution Vulnerability
CVE-2026-70024 9.8 CRITICAL Windows Internet Information Services Remote Code Execution Vulnerability
CVE-2026-96320 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-70147 9.8 CRITICAL Microsoft PostScript Printer Driver Remote Code Execution Vulnerability
CVE-2026-100222 9.8 CRITICAL Network Policy Server (NPS) Remote Code Execution Vulnerability
CVE-2026-97016 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-97816 9.8 CRITICAL Microsoft OpenSSH for Windows Remote Code Execution Vulnerability
CVE-2026-97749 9.8 CRITICAL Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-83578 9.8 CRITICAL Microsoft PowerShell Remote Code Execution Vulnerability
CVE-2026-96864 9.8 CRITICAL Microsoft Failover Cluster Virtual Driver Remote Code Execution Vulnerability
CVE-2026-97814 9.8 CRITICAL Windows Text Shaping Remote Code Execution Vulnerability
CVE-2026-97815 9.8 CRITICAL Windows Error Reporting Remote Code Execution Vulnerability
CVE-2026-70300 9.8 CRITICAL Microsoft Office Word Remote Code Execution Vulnerability

Showing top 20 of 1407 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows 11 Version 24H2
Same vendor: Microsoft
Same weakness: CWE-59

V. Comments for CVE-2026-97790

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