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CVE-2026-21241

nvd nist
Published: Feb 10, 2026Modified: Feb 11, 2026

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7.0
Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.0 / Impact: 5.9
Source: secure@microsoft.com

Description

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected (9)

Microsoft
6 products
Windows 11 23h2
Windows 11 24h2
Windows 11 25h2
Windows Server 2022
Windows Server 2022 23h2
Windows Server 2025
Configuration A
9 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
Windows 11 23h2
Before 10.0.22631.6649
Windows 11 23h2
Before 10.0.22631.6649
Microsoft
Windows 11 24h2
Before 10.0.26100.7781
Windows 11 24h2
Before 10.0.26100.7781
Microsoft
Windows 11 25h2
Before 10.0.26200.7781
Windows 11 25h2
Before 10.0.26200.7781
Windows Server 2022
Before 10.0.20348.4711
Windows Server 2022 23h2
Before 10.0.25398.2149
Windows Server 2025
Before 10.0.26100.32313

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.