EUVD-2026-43880
GHSA-pjvc-v637-5rjg
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated EoP with full kernel impact; AC raised to H because winning the race condition requires favorable timing not fully under attacker control.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows USB Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows USB Driver (kernel-mode) lets an already-authenticated low-privileged user win a race condition (CWE-362) to elevate to SYSTEM. The flaw spans a broad Windows fleet from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated local user on the target (CVSS PR:L, AV:L) able to execute code that interacts with the USB driver stack; there is no remote or network vector and no user interaction is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.8 (High): local attack vector, low complexity, low privileges required, no user interaction, and full confidentiality/integrity/availability impact with unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user who already has code execution on a Windows host - for example on a shared RDS/VDI server or via a compromised standard account - runs a local tool that repeatedly triggers the vulnerable USB driver code path to win the timing window. On a successful race the attacker corrupts kernel state and elevates from a standard user to SYSTEM, gaining full control of the machine. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50321 to every affected edition - install the relevant monthly cumulative/security-only update for each Windows 10/11 build and Windows Server 2012 through 2025 system, referencing the exact fixed build for your edition at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50321. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory affected systems running Windows 10 (versions 1607-26H1), Windows 11, and Windows Server (2012-2025) to establish total exposure. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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