CVE-2026-21242
Windows Subsystem for Linux Elevation of Privilege Vulnerability
HIGH 7.0
At a glance
- Source
- NVD
- EPSS
- EPSS 0.36 % · percentile 30 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Use after free in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.
Weaknesses (CWE)
- CWE-416 — Use After Free
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.0 | 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 | microsoft |
| CVSS 3.1 | HIGH 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · secure@microsoft.com (Secondary) |
European references
- ENISA EUVD · EUVD-2026-7353
- GCVE · GCVE-0-2026-21242
CERT-FR advisories
- CERTFR-2026-AVI-0150 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*< 10.0.19044.6937cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*< 10.0.19044.6937cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*< 10.0.19045.6937cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*< 10.0.19045.6937cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*< 10.0.22631.6649cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*< 10.0.22631.6649cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*< 10.0.26100.7781cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*< 10.0.26100.7781cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*< 10.0.26200.7781cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*< 10.0.26200.7781cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*< 10.0.20348.4711cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*< 10.0.25398.2149cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*< 10.0.26100.32313
Affected products
| Product | Versions |
|---|---|
| Microsoft · Windows 10 Version 21H2 | affected 10.0.19044.0 < 10.0.19044.6937 |
| Microsoft · Windows 10 Version 22H2 | affected 10.0.19045.0 < 10.0.19045.6937 |
| Microsoft · Windows 11 version 22H3 | affected 10.0.22631.0 < 10.0.22631.6649 |
| Microsoft · Windows 11 Version 23H2 | affected 10.0.22631.0 < 10.0.22631.6649 |
| Microsoft · Windows 11 Version 24H2 | affected 10.0.26100.0 < 10.0.26100.7840 |
| Microsoft · Windows 11 Version 25H2 | affected 10.0.26200.0 < 10.0.26200.7840 |
| Microsoft · Windows 11 version 26H1 | affected 10.0.28000.0 < 10.0.28000.1575 |
| Microsoft · Windows 11 Version 26H1 | affected 10.0.28000.0 < 10.0.28000.1575 |
| Microsoft · Windows Server 2022 | affected 10.0.20348.0 < 10.0.20348.4773 |
| Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation) | affected 10.0.25398.0 < 10.0.25398.2149 |
| Microsoft · Windows Server 2025 | affected 10.0.26100.0 < 10.0.26100.32370 |
| Microsoft · Windows Server 2025 (Server Core installation) | affected 10.0.26100.0 < 10.0.26100.32370 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |