CVE-2026-21237

Windows Subsystem for Linux Elevation of Privilege Vulnerability

En bref

Sévérité: HIGH 7.0
EPSS: EPSS 0.27 % · centile 20 (2026-10-27)
État: PUBLISHED
Publiée: 2026-02-10
Mise à jour: 2026-08-19
Attribuée par: microsoft
Statut NVD: Analyzed

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Subsystem for Linux allows an authorized attacker to elevate privileges locally.

Scores

Version	Score	Vecteur	Évalué par
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)

Faiblesses (CWE)

Références européennes

ENISA EUVD · EUVD-2026-7313
GCVE · GCVE-0-2026-21237

Avis du CERT-FR

CERTFR-2026-AVI-0150 — Multiples vulnérabilités dans Microsoft Windows · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* < 10.0.19044.6937
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* < 10.0.19044.6937
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* < 10.0.19044.6937
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* < 10.0.19045.6937
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:* < 10.0.19045.6937
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:* < 10.0.19045.6937
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* < 10.0.22631.6649
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* < 10.0.22631.6649
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* < 10.0.26100.7781
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:* < 10.0.26100.7781
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* < 10.0.26200.7781
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:* < 10.0.26200.7781
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* < 10.0.20348.4711
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* < 10.0.25398.2149
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* < 10.0.26100.32313

Produits affectés

Produit	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

Références

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21237

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