EUVD-2026-44052
GHSA-p772-w8jr-9x5v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, low-complexity EoP by an authenticated user (AV:L/AC:L/PR:L, UI:N); kernel-context compromise 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
Untrusted pointer dereference in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Resilient File System (ReFS) lets an authenticated local attacker gain elevated (SYSTEM-level) privileges by triggering an untrusted pointer dereference in the ReFS driver. It affects a broad range of Windows 10, Windows 11, and Windows Server 2016-2025 builds. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local access with an existing authenticated account on the target (CVSS PR:L, AV:L), and the host must have ReFS in use for the vulnerable driver code path to be reachable - a condition more commonly met on Windows Server storage/backup roles than on default client installs. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U with C:H/I:H/A:H, base 7.8) describes a locally exploitable flaw of low complexity requiring only low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact - a classic local EoP profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged account or code execution on a Windows/Windows Server host with ReFS in use crafts filesystem metadata or a system call that feeds an untrusted pointer into the ReFS kernel driver. The resulting controlled dereference corrupts kernel memory and is leveraged to execute code as SYSTEM, escalating from a limited user to full machine control. … |
| Remediation | Apply the Microsoft security update for your specific Windows/Windows Server build (Patch available per vendor advisory) - see https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50441 for the exact fixed build per SKU, as precise fixed version numbers are not included in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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