CVE-2026-6726: MITRE: CVE-2026-6726 TPM 2.0 Improper Object Slot Reuse

Overview

Severity

High (CVSS 7.9)

CVSS Vector

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

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Aug

Released

2026-08-11

Description

CVE-2026-6726 is a Spoofing vulnerability in the TPM 2.0 reference implementation involving improper object-slot reuse. MITRE assigned this CVE on behalf of the Trusted Computing Group. This document incorporates updates to Microsoft Windows that address this vulnerability. Please see CVE-2026-6726 for more information.

FAQ

Q: Will Microsoft provide updates for Windows Server 2012 and Windows Server 2012 R2? No Windows update is planned for these releases. The affected vTPM scenario does not support Windows Server 2012 or Windows Server 2012 R2, and these releases do not include the TPM-stack and protocol dependencies required for the new v2 attestation mitigation. Customers should contact their hardware manufacturer or OEM to obtain and apply the applicable TPM firmware security update. Q: Will Microsoft provide updates for Windows Server 2016? Windows Server 2016 received the applicable Windows vTPM security update. However, it does not include the additional TPM-stack and protocol dependencies required for the new v2 attestation mitigation. Customers should contact their hardware manufacturer or OEM to obtain and apply the applicable TPM firmware security update.

Affected Products (30)

Windows

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows Server 2025
• Windows 11 version 26H1 for x64-based Systems
• Windows 11 Version 26H1 for ARM64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems

ESU

• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems

Azure

• Azure Confidential Compute VM SKU DCasv5/DCadsv5
• Azure Confidential Compute VM SKU ECasv5/ECadsv5
• Azure Confidential Compute VM SKU DCasv6/DCadsv6
• DCesv6-series Azure VM
• Azure Confidential Compute VM SKU ECasv6/ECadsv6
• Ecesv6-series Azure VM

Security Updates (11)

• 5120238
• 5120242
• 5120229
• 5120249
• 5120233
• 5120228
• 5121003
• 5120994
• 5120240
• 5121000
• 5120418

Acknowledgments

Anonymous

Revision History

• 2026-08-11: Information published.