7.8
High
CVE-2026-20859 Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally
Description
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server 2025 (Server Core installation) 10.0 | 10.0.26100.0 → < 10.0.26100.32230 | 10.0.26100.32230 |
| Windows 11 Version 25H2 10.0 | 10.0.26200.0 → < 10.0.26200.7623 | 10.0.26200.7623 |
| Windows 11 Version 24H2 10.0 | 10.0.26100.0 → < 10.0.26100.7623 | 10.0.26100.7623 |
| Windows Server 2025 10.0 | 10.0.26100.0 → < 10.0.26100.32230 | 10.0.26100.32230 |
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