Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

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Vendors Products
Microsoft Subscribe
Windows 10 21h2 Subscribe
Windows 10 21h2 Subscribe
Windows 10 22h2 Subscribe
Windows 10 22h2 Subscribe
Windows 11 22h3 Subscribe
Windows 11 23h2 Subscribe
Windows 11 23h2 Subscribe
Windows 11 24h2 Subscribe
Windows 11 24h2 Subscribe
Windows 11 25h2 Subscribe
Windows 11 25h2 Subscribe
Windows 11 26h1 Subscribe
Windows 11 26h1 Subscribe
Windows Server 2022 Subscribe
Windows Server 2022, 23h2 Edition (server Core Installation) Subscribe
Windows Server 2022 23h2 Subscribe
Windows Server 2025 Subscribe
Windows Server 2025 (server Core Installation) Subscribe
Windows Server 23h2 Subscribe
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 12 Feb 2026 12:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 11 22h3
Microsoft windows 11 26h1
Microsoft windows Server 2022, 23h2 Edition (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows 11 22h3
Microsoft windows 11 26h1
Microsoft windows Server 2022, 23h2 Edition (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Wed, 11 Feb 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2022 23h2
CPEs cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows Server 2022 23h2

Tue, 10 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Description Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.
Title Windows Subsystem for Linux Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-02-20T21:52:19.034Z

Reserved: 2025-12-11T21:02:05.735Z

Link: CVE-2026-21242

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-02-10T18:16:25.323

Modified: 2026-02-11T20:56:41.543

Link: CVE-2026-21242

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-12T12:32:08Z

Weaknesses