Main Vulnerability Database Vulnerabilities #VU154670

Use-after-free in Microsoft Windows and Windows Server - CVE-2026-70243

Published: October 14, 2026

Vulnerability identifier: #VU154670

CSH Severity: Low

CVSS v4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-70243

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges to SYSTEM.

The vulnerability exists due to use-after-free in Windows Kernel when a race condition occurs. A local user can win the race condition to escalate privileges to SYSTEM.

Affected software

Microsoft Windows
Windows Server

How to mitigate CVE-2026-70243

Install security update from vendor's website.

Microsoft Windows - update to 11 23H2 10.0.22631.7652
Windows Server - update to 2025 10.0.26100.33650

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-70243

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