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CVE-2026-40410

Windows SMB Client Elevation of Privilege Vulnerability

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 10.0.14393.9140, 10.0.17763.8755, 10.0.19044.7291, 10.0.19045.7417, 10.0.22631.7079, and 8 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Microsoft Windows 10 Version 1607

    From 10.0.14393.0 · fixed in 10.0.14393.9140

  • Microsoft Windows 10 Version 1809

    From 10.0.17763.0 · fixed in 10.0.17763.8755

  • Microsoft Windows 10 Version 21H2

    From 10.0.19044.0 · fixed in 10.0.19044.7291

  • Microsoft Windows 10 Version 22H2

    From 10.0.19045.0 · fixed in 10.0.19045.7417

  • Microsoft Windows 11 version 23H2

    From 10.0.22631.0 · fixed in 10.0.22631.7079

  • Microsoft Windows 11 Version 23H2

    From 10.0.22631.0 · fixed in 10.0.22631.7219

  • Microsoft Windows 11 Version 24H2

    From 10.0.26100.0 · fixed in 10.0.26100.8457

  • Microsoft Windows 11 Version 25H2

    From 10.0.26200.0 · fixed in 10.0.26200.8457

  • Microsoft Windows 11 version 26H1

    From 10.0.28000.0 · fixed in 10.0.28000.2113

  • Microsoft Windows Server 2012 R2

    From 6.3.9600.0 · fixed in 6.3.9600.23181

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    From 6.3.9600.0 · fixed in 6.3.9600.23181

  • Microsoft Windows Server 2016

    From 10.0.14393.0 · fixed in 10.0.14393.9140

  • Microsoft Windows Server 2016 (Server Core installation)

    From 10.0.14393.0 · fixed in 10.0.14393.9140

  • Microsoft Windows Server 2019

    From 10.0.17763.0 · fixed in 10.0.17763.8755

  • Microsoft Windows Server 2019 (Server Core installation)

    From 10.0.17763.0 · fixed in 10.0.17763.8755

  • Microsoft Windows Server 2022

    From 10.0.20348.0 · fixed in 10.0.20348.5139

  • Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

    From 10.0.25398.0 · fixed in 10.0.25398.2330

  • Microsoft Windows Server 2025

    From 10.0.26100.0 · fixed in 10.0.26100.32860

  • Microsoft Windows Server 2025 (Server Core installation)

    From 10.0.26100.0 · fixed in 10.0.26100.32860

References 1

msrc.microsoft.com