CVE-2026-96249: Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability
Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.
Other sources
Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26300.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.3231Patch KB5127646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.9711Patch KB5127648 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26200.9711Patch KB5127648
Event History
Frequently Asked Questions
Which systems are listed as affected?
The affected software list includes Microsoft Windows 11, Microsoft Windows Server 2025, and the Microsoft Windows Win32 Kernel Subsystem.
Does exploitation require network access or user interaction?
The CVSS vector indicates local access is required (AV:L) and no user interaction is required (UI:N).
What level of access does an attacker need before exploiting this issue?
The CVSS vector lists privileges required as low (PR:L), indicating the attacker must already have some authorized local access.
What could an attacker gain through successful exploitation?
Successful exploitation can elevate local privileges. The listed CVSS impacts rate confidentiality, integrity, and availability as high.