CVE-2026-20859
High
Description
Use after free in Windows Kernel-Mode Drivers allows an authorized attacker to elevate privileges locally.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft Windows
PublishedJan 13, 2026
First seenJan 13, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- microsoft windows_11_24h210.0.26100.7623 or later
- microsoft windows_11_25h210.0.26200.7623 or later
- microsoft windows_server_202510.0.26100.32230 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_11_24h2 | v < 10.0.26100.7623 | 10.0.26100.7623 |
| microsoft windows_11_25h2 | v < 10.0.26200.7623 | 10.0.26200.7623 |
| microsoft windows_server_2025 | v < 10.0.26100.32230 | 10.0.26100.32230 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.