CVE-2026-21245
High
Description
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft Windows
PublishedFeb 10, 2026
First seenFeb 10, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- microsoft windows_11_24h210.0.26100.7781 or later
- microsoft windows_11_25h210.0.26200.7781 or later
- microsoft windows_server_202510.0.26100.32313 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_11_24h2 | v < 10.0.26100.7781 | 10.0.26100.7781 |
| microsoft windows_11_25h2 | v < 10.0.26200.7781 | 10.0.26200.7781 |
| microsoft windows_server_2025 | v < 10.0.26100.32313 | 10.0.26100.32313 |
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