Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only race condition (AV:L, AC:H) exploitable by an existing low-privileged user (PR:L) with no user interaction, yielding full SYSTEM-level compromise (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
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 affects Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, where a race condition (improper synchronization of a shared resource) lets an already-authenticated local user win a timing window to execute code at elevated privilege. Reported by Microsoft with a patch available; no public exploit identified at time of analysis and it is not on CISA KEV. The high CVSS attack complexity (AC:H) reflects that the attacker must reliably win a narrow race, which tempers real-world exploitability.
Technical ContextAI
The flaw lives in the Windows USB print stack, the kernel-mode/driver components that service USB-attached printer devices. The root cause is CWE-362, a concurrent execution race condition: two or more threads access a shared resource without proper synchronization (locking/serialization), creating a time-of-check to time-of-use window an attacker can exploit to corrupt state or redirect a privileged operation. Per the CPE data the affected code ships in Windows 11 version 24H2, 25H2 and 26H1, plus Windows Server 2025 including Server Core installations, indicating this is current-branch Windows driver code rather than a legacy component.
RemediationAI
Apply the Microsoft security update for CVE-2026-49806 as documented in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49806 (Patch available per vendor advisory; exact fixed build not stated in the provided data, so pull the per-SKU KB from the advisory). Prioritize Windows 11 24H2/25H2/26H1 endpoints and Windows Server 2025 hosts, including Server Core. Where immediate patching is not possible, the practical compensating control for a USB-print EoP is to reduce local attack surface: restrict interactive and local logon to trusted administrators (the attacker needs PR:L local access), and on servers with no printing role disable or restrict the print/USB print components - with the trade-off that this breaks local and USB printer functionality for legitimate users. There is no network-facing control that mitigates this local-only flaw, so patching remains the durable fix.
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43824
GHSA-54fg-m6mq-prvp