EUVD-2026-73104
GHSA-vq7f-25r4-mfwj
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector confirmed; low-privilege standard user sufficient; no UI required; kernel write grants full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds write in Windows Spaceport.sys allows an authorized attacker to execute code locally.
AnalysisAI
Local privilege escalation in the Windows Spaceport.sys kernel driver (associated with Windows Subsystem for Linux / virtualization infrastructure) allows a low-privileged authenticated local user to execute arbitrary code, likely achieving SYSTEM-level access, via an out-of-bounds write condition. The vulnerability spans an exceptionally broad surface: Windows 10, Windows 11 (through 26H1), and Windows Server 2012 through 2025 are all affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an existing low-privileged local user account on the affected Windows system - no special configuration, no elevated privileges, and no user interaction are needed beyond that initial foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately reflects a high-severity LPE. … 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-released patches corresponding to the fixed build numbers for each affected Windows version as listed in the affected products section. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server 2012-2025 systems in your environment, with special attention to virtualization and WSL-enabled infrastructure where Spaceport.sys is most active. …
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Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today