EUVD-2026-44004
GHSA-2mw6-86fr-phq8
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L, PR:L) must win a hard-to-hit race (AC:H) with no user interaction; successful EoP yields full C/I/A impact within an unchanged scope.
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 on Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 lets an already-authenticated low-privileged user win a timing race in the driver to gain elevated privileges. Reported by Microsoft with a patch available; no public exploit identified at time of analysis and it is not listed in CISA KEV. The high attack complexity (must reliably win a race window) tempers real-world exploitability despite full confidentiality, integrity, and availability impact.
Technical ContextAI
The flaw is a CWE-362 concurrent-execution race condition ('shared resource with improper synchronization') inside the USB print driver stack that Windows loads to service USB-attached printers. Because kernel-mode or privileged driver code accesses a shared resource without adequate locking, a low-privileged process that operates on the same resource concurrently can interleave its actions during the unsynchronized window to corrupt state or substitute a privileged operation. The CPE set scopes the defect to modern client and server builds - Windows 11 Version 24H2/25H2/26H1 and Windows Server 2025 including Server Core - indicating the affected driver code was introduced or persists specifically in these current releases rather than legacy versions.
RemediationAI
Patch available per vendor advisory: apply Microsoft's security update for CVE-2026-54111 via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54111, which delivers the fix through the monthly cumulative update for each affected build (Windows 11 24H2/25H2/26H1 and Windows Server 2025, including Server Core). The exact fixed build number was not provided in this data - pull the KB/version directly from the MSRC page for your OS before deploying, and do not substitute an invented version. As a compensating control until patched, restrict interactive and local logon to trusted administrators on affected hosts (this is a local, authenticated-attacker vector), which reduces the pool of principals who could attempt the race but does not help on shared multi-user or RDS/terminal hosts; where USB printing is unused, disabling or blocking the USB print driver/spooler-related USB device installation reduces attack surface at the cost of losing local USB printer functionality.
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Same weakness CWE-362 – Race Condition
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today