EUVD-2026-73057
GHSA-29gg-g6w6-7rx4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privilege session required; AC:L because no race condition or complex setup; full C/I/A from kernel SYSTEM escalation; scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Spaceport.sys allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in Spaceport.sys, the Windows kernel driver for the Storage Spaces subsystem, allows a low-privileged authenticated local user to escalate privileges to SYSTEM on affected Windows hosts. The vulnerability spans an exceptionally wide range of Microsoft Windows releases, from Windows Server 2012 and Windows 10 Version 1607 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session with low-privilege (standard user) rights, matching CVSS PR:L and the vendor description 'authorized attacker.' The attacker must be able to issue I/O requests to the Spaceport.sys kernel driver; this driver is loaded on Windows systems by default and does not require Storage Spaces to be actively provisioned with virtual disks. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately captures a high-severity local privilege escalation with full kernel impact but constrained by the requirement for a pre-existing local authenticated session. … 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 Microsoft's cumulative security updates via Windows Update, WSUS, or SCCM to reach the fixed build for each release: Windows 10 1607 and Server 2016 to 10.0.14393.9512 or later; Windows 10 1809 and Server 2019 to 10.0.17763.9245 or later; Windows 10 21H2 to 10.0.19044.7725 or later; Windows 10 22H2 to 10.0.19045.7725 or later; Windows Server 2022 to 10.0.20348.5622 or later; Windows 11 23H2 to 10.0.22631.7582 or later; Windows 11 24H2 and Server 2025 to 10.0.26100.9445 (client) or 10.0.26100.33438 (server) or later; Windows 11 25H2 to 10.0.26200.9445 or later; Windows 11 26H1 to 10.0.28000.2954 or later; Windows Server 2012 to 6.2.9200.26349 or later; Windows Server 2012 R2 to 6.3.9600.23397 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Immediately inventory all Windows 10, 11, and Windows Server 2012 through 2025 systems to identify scope; complete this within 24 hours. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today