HarborGuard / CVE
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HIGHCVE-2026-34345Published Modified CNA microsoft

CVE-2026-34345: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Metrics

CVSS v3.1
7.0
Severity
HIGH
Fixed in
10.0.14393.9140
Affected Products
17

Fix available

10.0.14393.914010.0.17763.875510.0.19044.729110.0.19045.729110.0.20348.513910.0.22631.707910.0.25398.233010.0.26100.845710.0.26100.3286010.0.26200.845710.0.28000.2113
Patch commits
Affected packages
  • Microsoft / Windows 10 Version 1607
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows 10 Version 1809
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows 10 Version 21H2
    < 10.0.19044.7291 (from 10.0.19044.0)
  • Microsoft / Windows 10 Version 22H2
    < 10.0.19045.7291 (from 10.0.19045.0)
  • Microsoft / Windows 11 version 22H3
    < 10.0.22631.7079 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 23H2
    < 10.0.22631.7079 (from 10.0.22631.0)
  • Microsoft / Windows 11 Version 24H2
    < 10.0.26100.8457 (from 10.0.26100.0)
  • Microsoft / Windows 11 Version 25H2
    < 10.0.26200.8457 (from 10.0.26200.0)
  • Microsoft / Windows 11 version 26H1
    < 10.0.28000.2113 (from 10.0.28000.0)
  • Microsoft / Windows Server 2016
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows Server 2016 (Server Core installation)
    < 10.0.14393.9140 (from 10.0.14393.0)
  • Microsoft / Windows Server 2019
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows Server 2019 (Server Core installation)
    < 10.0.17763.8755 (from 10.0.17763.0)
  • Microsoft / Windows Server 2022
    < 10.0.20348.5139 (from 10.0.20348.0)
  • Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
    < 10.0.25398.2330 (from 10.0.25398.0)
  • Microsoft / Windows Server 2025
    < 10.0.26100.32860 (from 10.0.26100.0)
  • Microsoft / Windows Server 2025 (Server Core installation)
    < 10.0.26100.32860 (from 10.0.26100.0)
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References