CVE-2026-21231

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

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

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-362

Affected software

VendorProductVersions
MicrosoftWindows 10 Version 1607>= 10.0.14393.0, < 10.0.14393.8868
MicrosoftWindows 10 Version 1809>= 10.0.17763.0, < 10.0.17763.8389
MicrosoftWindows 10 Version 21H2>= 10.0.19044.0, < 10.0.19044.6937
MicrosoftWindows 10 Version 22H2>= 10.0.19045.0, < 10.0.19045.6937
MicrosoftWindows 11 version 22H3>= 10.0.22631.0, < 10.0.22631.6649
MicrosoftWindows 11 Version 23H2>= 10.0.22631.0, < 10.0.22631.6649
MicrosoftWindows 11 Version 24H2>= 10.0.26100.0, < 10.0.26100.7840
MicrosoftWindows 11 Version 25H2>= 10.0.26200.0, < 10.0.26200.7840
MicrosoftWindows 11 version 26H1>= 10.0.28000.0, < 10.0.28000.1575
MicrosoftWindows 11 Version 26H1>= 10.0.28000.0, < 10.0.28000.1575
MicrosoftWindows Server 2012>= 6.2.9200.0, < 6.2.9200.25923
MicrosoftWindows Server 2012 (Server Core installation)>= 6.2.9200.0, < 6.2.9200.25923
MicrosoftWindows Server 2012 R2>= 6.3.9600.0, < 6.3.9600.23022
MicrosoftWindows Server 2012 R2 (Server Core installation)>= 6.3.9600.0, < 6.3.9600.23022
MicrosoftWindows Server 2016>= 10.0.14393.0, < 10.0.14393.8868
MicrosoftWindows Server 2016 (Server Core installation)>= 10.0.14393.0, < 10.0.14393.8868
MicrosoftWindows Server 2019>= 10.0.17763.0, < 10.0.17763.8389
MicrosoftWindows Server 2019 (Server Core installation)>= 10.0.17763.0, < 10.0.17763.8389
MicrosoftWindows Server 2022>= 10.0.20348.0, < 10.0.20348.4773
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)>= 10.0.25398.0, < 10.0.25398.2149
MicrosoftWindows Server 2025>= 10.0.26100.0, < 10.0.26100.32370
MicrosoftWindows Server 2025 (Server Core installation)>= 10.0.26100.0, < 10.0.26100.32370

References

Timeline

Published
Feb 10, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

Related CVEs from 2026

CVE-2026-212327.8Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.CVE-2026-212347.0Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected Devices Platform Service alCVE-2026-212357.3Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.CVE-2026-212367.8Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.CVE-2026-212377.0Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Subsystem for Linux allows an authoriCVE-2026-212387.8Improper access control in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.CVE-2026-212397.8Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.CVE-2026-212407.0Time-of-check time-of-use (toctou) race condition in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.CVE-2026-212417.0Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.CVE-2026-212427.0Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.CVE-2026-212437.5Null pointer dereference in Windows LDAP - Lightweight Directory Access Protocol allows an unauthorized attacker to deny service over a netwCVE-2026-212447.3Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
CVE-2026-21231: High severity, CVSS 7.8 | Vulnix