EUVD-2026-43824
GHSA-54fg-m6mq-prvp
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
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 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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local, authenticated access to the target (CVSS PR:L, AV:L) - the attacker must already be able to run code as a low-privileged user on the machine. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0 High) describes a local, low-privilege, high-complexity attack with full CIA impact - a classic local elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds an ordinary user account or a low-privilege process on a Windows 11 24H2 or Windows Server 2025 host repeatedly triggers USB print driver operations while racing a second thread to hit the unsynchronized shared-resource window. On a successful race they corrupt privileged state and gain SYSTEM-level code execution, turning a limited foothold into full host control. … |
| Remediation | 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). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct inventory of Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems; prioritize shared-access endpoints and critical infrastructure for accelerated remediation. …
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External POC / Exploit Code
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