EUVD-2026-44017
GHSA-mr77-3w6c-769w
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with an existing low-privileged account (AV:L/PR:L), timing-dependent race gives AC:H, no user interaction, and a successful win yields full SYSTEM-level C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/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 Print Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows USB Print Driver affecting Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 lets an already-authenticated, low-privileged user win a race condition (CWE-362) in the driver to gain higher privileges. Microsoft has released a patch and reported the flaw itself; there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold a low-privileged authenticated account on the target (PR:L) with the ability to run code locally (AV:L) and interact with the USB Print Driver's device/print operations; no user interaction from a victim is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, meaning local access and existing low-level privileges (PR:L) are required, exploitation is difficult due to the race window (AC:H), and no user interaction is needed, yielding full confidentiality, integrity, and availability impact on the local system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user already logged onto a Windows 11 or Server 2025 machine runs a crafted program that repeatedly triggers concurrent USB print driver operations to hit the narrow race window, corrupting shared driver state to execute code or alter data with SYSTEM privileges. Given AC:H, the attacker likely loops the trigger many times to reliably win the race. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-54996 to all affected SKUs (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core) as the primary and complete fix - the exact KB/build is listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54996. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems and assess USB print driver exposure to low-privilege users, restricting access where operationally feasible. …
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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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