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"product": "windows_server_2025", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32690)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Windows Server 2025 (Server Core installation)", "source": "cna", "vendor": "Microsoft"}, "product": "windows_server_2025_(server_core_installation)", "vendor": "microsoft"}], "analysis": {"en": {"generated_at": "2026-04-14T19:27:17.265101+00:00", "value": {"mitigation_remediation": ["Apply the Microsoft security update available for CVE\u20112026\u201127921 to all Windows 10, 11, and Windows Server machines listed above.", "Confirm the update was installed successfully by checking Windows Update history or the Microsoft update guide.", "Once updated, review system logs to verify that tdx.sys is not misbehaving and that no local privilege escalation incidents occur."], "summary": {"action": "Patch Immediately", "impact": "Local Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Affected systems include Microsoft Windows 10 versions 1607, 1809, 21H2, and 22H2, and Windows 11 versions 23H2, 24H2, 25H2, 22H3, and 26H1, as well as Windows Server editions 2012, 2012 R2, 2016, 2019, 2022, 2025 and the 23H2 Server edition. Both Server Core installations and full desktop editions are affected across x86, x64 and ARM64 architectures where the tdx.sys driver is present.", "description_and_impact": "The vulnerability is a race condition in the Windows TDI Translation Driver (tdx.sys) that allows an authorized local attacker to elevate their privileges. Improper synchronization of a shared resource leads to an improper state that can be exploited to gain higher privileges. This weakness, identified as CWE-362 and CWE-416, can compromise confidentiality, integrity and availability by permitting an attacker with some local access to execute code with SYSTEM rights.", "risk_and_exploitability": "The CVSS score of 7 indicates high severity, and although EPSS data is not available and the vulnerability is not listed in KEV, the presence of a Microsoft update suggests some exploitation risk in the wild. The attack requires local, authorized access to the target machine, making it a local privilege escalation vector. Operators should treat this as a priority update to prevent potential elevation of privileges by malicious scripts or applications running under user context."}}}}, "created": "2026-04-15T15:15:06.640828+00:00", "updated": "2026-04-15T21:00:09.632456+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_10_1607", "microsoft$PRODUCT$windows_10_1809", "microsoft$PRODUCT$windows_10_21h2", "microsoft$PRODUCT$windows_10_22h2", "microsoft$PRODUCT$windows_11_22h3", "microsoft$PRODUCT$windows_11_23h2", "microsoft$PRODUCT$windows_11_24h2", "microsoft$PRODUCT$windows_11_25h2", "microsoft$PRODUCT$windows_11_26h1", "microsoft$PRODUCT$windows_server_2012", "microsoft$PRODUCT$windows_server_2012_(server_core_installation)", "microsoft$PRODUCT$windows_server_2012_r2", "microsoft$PRODUCT$windows_server_2012_r2_(server_core_installation)", "microsoft$PRODUCT$windows_server_2016", "microsoft$PRODUCT$windows_server_2016_(server_core_installation)", "microsoft$PRODUCT$windows_server_2019", "microsoft$PRODUCT$windows_server_2019_(server_core_installation)", "microsoft$PRODUCT$windows_server_2022", "microsoft$PRODUCT$windows_server_2022,_23h2_edition_(server_core_installation)", "microsoft$PRODUCT$windows_server_2025", "microsoft$PRODUCT$windows_server_2025_(server_core_installation)"]}