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TI-2026-29170 Aliases CVE-2026-40402GHSA-h659-hh52-mv97

Windows Hyper-V Elevation of Privilege Vulnerability

Priority MEDIUM 42CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00332 26th percentileScored 2026-11-07
Fix Fixed Microsoft: 4 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows 11 version 23H210.0.22631.0 to before 10.0.22631.707910.0.22631.7079Patch availableCNA
MicrosoftWindows 11 Version 23H210.0.22631.0 to before 10.0.22631.721910.0.22631.7219Patch availableCNA
MicrosoftWindows Server 202210.0.20348.0 to before 10.0.20348.513910.0.20348.5139Patch availableCNA
  • Windows 11 version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7079 Fixed in 10.0.22631.7079 Patch available CNA
  • Windows 11 Version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7219 Fixed in 10.0.22631.7219 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.5139 Fixed in 10.0.20348.5139 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*before 10.0.22631.7079VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*before 10.0.22631.7079VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*before 10.0.20348.5074VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* Versions before 10.0.22631.7079 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* Versions before 10.0.22631.7079 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions before 10.0.20348.5074 Vulnerable ·Microsoft

Remediation

Microsoft 4 updates

  • KB5093998
    Security Update
    • Windows 11 Version 22H2 for ARM64-based Systems 10.0.22631.7219
    • Windows 11 Version 22H2 for x64-based Systems 10.0.22631.7219
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7219
    • Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7219
  • KB5087545
    Security Update
    • Windows Server 2022 10.0.20348.5139
    • Windows Server 2022 (Server Core installation) 10.0.20348.5139
  • KB5087424
    Security Hotpatch Update
    • Windows Server 2022 10.0.20348.5074
    • Windows Server 2022 (Server Core installation) 10.0.20348.5074
Show 1 more Microsoft updates
  • KB5087420
    Security Update
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7079

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40402
  2. 2026-10-03 Alias added: GHSA-h659-hh52-mv97

References

Patch 1

  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-73128 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17367 MSHTML Framework Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17364 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24042 Internet Shortcut Files Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
See all 3407 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences