CVE-2026-34345

high Microsoft
CVSS v3 Base Score
7.0
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
Attack Characteristics
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: May 12, 2026 (1 days ago)
Last Modified: May 13, 2026
Vendor: Microsoft
Source: MITRE

Description

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.

CWE

CWE-362

Affected Products

Microsoft Windows 10 Version 1607Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 21H2Microsoft Windows 10 Version 22H2Microsoft Windows 11 version 22H3Microsoft Windows 11 Version 23H2Microsoft Windows 11 Version 24H2Microsoft Windows 11 Version 25H2Microsoft Windows 11 version 26H1Microsoft Windows Server 2016

References

🔗 msrc.microsoft.com