EUVD-2026-44003
GHSA-mvwv-cxfc-w333
Severity by source
AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical USB insertion required (AV:P, AC:H for race condition timing); no OS authentication needed for a physically present attacker (PR:N); full local system compromise on successful exploitation (C/I/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows USB Print Driver allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation via use-after-free in the Windows USB Print Driver affects Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025, requiring physical access to exploit. An attacker with hands-on access to a target machine can trigger a memory corruption condition through the USB print subsystem to achieve full local privilege escalation - High confidentiality, integrity, and availability impact per CVSS. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Physical access to the target machine and access to a USB port are the primary prerequisites - the CVSS AV:P vector confirms this is not remotely exploitable. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite High ratings across Confidentiality, Integrity, and Availability, the CVSS base score of 6.4 reflects the significant exploitation barrier imposed by AV:P (physical access vector) and AC:H (high attack complexity). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with unsupervised physical access to a Windows 11 or Server 2025 machine - such as a rogue insider, cleaning staff with facility access, or an attacker briefly alone with a kiosk - connects a specially crafted USB device designed to trigger a race condition in the USB Print Driver. The device manipulates driver memory allocation timing to exploit a use-after-free condition, redirecting execution to attacker-controlled code and escalating from a low-privilege or guest-level session to SYSTEM. … |
| Remediation | Apply the vendor-released patch from Microsoft, available via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55000. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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