EUVD-2026-44014
GHSA-7mf4-r8f9-vvqp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires existing low-privileged local access to reach the ReFS driver (AV:L/PR:L), low complexity, no interaction, and kernel code execution yields full C/I/A impact within an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.
AnalysisAI
Local privilege escalation to code execution in the Windows Resilient File System (ReFS) driver affects a broad range of Windows 10/11 and Windows Server 2016 through 2025 releases, where an integer overflow (CWE-190) in filesystem processing lets an already-authenticated local user run arbitrary code in an elevated context. The CVSS 3.1 vector (AV:L/PR:L) confirms low-privileged local access is required rather than remote exploitation, and 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 possess authenticated local access at a low privilege level (CVSS PR:L, AV:L) and to be able to reach the ReFS filesystem driver - i.e. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a solid, actionable local escalation issue but not a top-of-queue emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged access to a Windows host - via phishing, a compromised standard-user account, or malware - crafts or mounts a malicious ReFS structure, or triggers a specially formed operation against an ReFS volume, causing the integer overflow in the kernel driver and executing code with SYSTEM-level privileges. This turns an initial foothold into full host compromise. … |
| Remediation | Apply the Microsoft security update for CVE-2026-54109 - Vendor-released patch: available from vendor via the monthly cumulative update for each affected OS; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54109 for the exact fixed build per Windows 10/11 and Server SKU and deploy it through Windows Update, WSUS or your patch-management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory Windows 10, 11, and Server 2016-2025 systems to quantify organizational exposure. …
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Buffer Overflow
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External POC / Exploit Code
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