EUVD-2026-56348
GHSA-cg93-vwrm-9mr8
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical media insertion is the sole access requirement; no privileges or user interaction needed; full kernel compromise achieved on success with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an unauthorized attacker to execute code with a physical attack.
AnalysisAI
Heap-based buffer overflow in the Windows Universal Disk Format File System Driver (UDFS) enables kernel-level code execution through physical insertion of maliciously crafted UDF media, affecting every supported Windows client and server release from Server 2012 through Windows 11 26H1. The physical attack vector (AV:P) is the dominant risk constraint - a vendor patch is available from Microsoft and the vulnerability is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to be physically present at the target machine and able to insert removable storage media (USB drive, optical disc, or other UDF-capable device). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.8 accurately reflects a tension between maximum impact (C:H/I:H/A:H - full kernel compromise) and severely constrained reach (AV:P - physical presence mandatory). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security update immediately via Windows Update or WSUS; exact patched build thresholds confirmed by EUVD data are: Windows Server 2012 >= 6.2.9200.26279, Windows Server 2012 R2 >= 6.3.9600.23337, Windows Server 2016 >= 10.0.14393.9418, Windows Server 2019 / Windows 10 1809 >= 10.0.17763.9115, Windows Server 2022 >= 10.0.20348.5499, Windows Server 2025 / Windows 11 24H2 >= 10.0.26100.33296 (server) and 10.0.26100.9168 (client), Windows 10 21H2 >= 10.0.19044.7663, Windows 10 22H2 >= 10.0.19045.7663, Windows 11 23H2 >= 10.0.22631.7517, Windows 11 25H2 >= 10.0.26200.9168, and Windows 11 26H1 >= 10.0.28000.2704. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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