EUVD-2026-44246
GHSA-fw6g-55xx-prrm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote pre-auth with full CIA impact, but AC:H because reliably winning a kernel race condition over the network requires precise timing and repeated attempts.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:N/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 Server Network driver allows an unauthorized attacker to execute code over a network.
AnalysisAI
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthorized attacker execute arbitrary code across a wide range of Microsoft Windows client and server builds, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N) indicates unauthenticated network exploitation with full confidentiality, integrity, and availability impact, and an 'Authentication Bypass' tag suggests the flaw can also subvert access controls. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS vector (AV:N/AC:L/PR:N/UI:N) indicates no authentication and no user interaction are required - remote unauthenticated exploitation is possible against affected Windows/Windows Server hosts reachable on the vulnerable network service. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals mostly align toward high priority: CVSS 3.1 base 9.8 with AV:N/AC:L/PR:N/UI:N describes remote, unauthenticated, no-interaction exploitation with full CIA impact, and the affected footprint (nearly every supported Windows and Windows Server build) is enormous. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network reachability to a vulnerable Windows or Windows Server host sends a rapid, precisely timed sequence of crafted packets to the network service to trigger the race condition in the kernel network driver, corrupting shared driver state. By winning the race across repeated attempts, the attacker achieves code execution in a privileged context without any credentials or user interaction. … |
| Remediation | Apply the Microsoft security update for CVE-2026-56188 as the primary fix; a patch is available per vendor advisory (exact fixed build numbers are not stated in the input, so confirm the specific KB/build for each OS at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56188). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows systems running versions 1607 through 11 26H1 (clients) and Server 2012 through 2025 (servers) to determine patch scope, prioritizing production servers, domain controllers, and internet-facing systems. …
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Same weakness CWE-362 – Race Condition
View allSame technique Authentication Bypass
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External POC / Exploit Code
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