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CVE-2026-97792: Windows 11 and Server 2022 allow local privilege increase

CVE-2026-97792 · published 22 days ago

Summary

The container isolation component in Windows 11 (versions 23H2 through 26H2) and Windows Server 2022 does not correctly limit who can use it. An attacker who already has access to the system could use this flaw to gain higher-level rights and take control of more functions. Install the latest security updates from Microsoft as soon as they are available.

What to do

Update microsoft windows 11 version 23h2 to version 10.0.22631.7652 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.9711 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.9711 or later.
Update microsoft windows 11 version 26h2 to version 10.0.26300.9711 or later.
Update microsoft windows server 2022 to version 10.0.20348.5761 or later.
Update microsoft windows server 2025 to version 10.0.26100.33650 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33650 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.7652 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.9711 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.9711 or later.
Update microsoft windows_11_26h2 to version 10.0.26300.9711 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5761 or later.
Update microsoft windows_server_2025 to version 10.0.26100.33650 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 11 version 23h2	< 10.0.22631.7652
microsoft	windows 11 version 24h2	< 10.0.26100.9711
microsoft	windows 11 version 25h2	< 10.0.26200.9711
microsoft	windows 11 version 26h2	< 10.0.26300.9711
microsoft	windows server 2022	< 10.0.20348.5761
microsoft	windows server 2025	< 10.0.26100.33650
microsoft	windows server 2025 (server core installation)	< 10.0.26100.33650
microsoft	windows_11_23h2	< 10.0.22631.7652 `cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.9711 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.9711 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h2	< 10.0.26300.9711 `cpe:2.3:o:microsoft:windows_11_26h2:::::::arm64:*`
microsoft	windows_server_2022	< 10.0.20348.5761 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2025	< 10.0.26100.33650 `cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*`

Original advisory text

Windows Container Isolation FS Filter Driver (unionfs.sys) Elevation of Privilege Vulnerability

Improper access control in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97792 vendor-advisory patch

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-732Incorrect Permission Assignment for Critical Resource

Timeline

Published13 Oct 2026

Updated31 Oct 2026

First seen13 Oct 2026

Sources

CVE-2026-97792 · NVD

CVE-2026-97792 · MITRE

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