EUVD-2026-43832
GHSA-hpjj-hpjh-hcfp
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Physical presence required with no credentials or user interaction needed; full C/I/A impact on the vulnerable system with no scope change to other systems.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Spaceport.sys allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation to SYSTEM level is achievable in Windows Spaceport.sys - the kernel-mode Storage Spaces port driver - across a wide range of Windows 10, Windows 11, and Windows Server releases, when an attacker has physical access to the target machine. An integer overflow or wraparound in the driver's arithmetic logic (CWE-190) can corrupt kernel memory structures, enabling full compromise of confidentiality, integrity, and availability. No public exploit identified at time of analysis, and SSVC confirms exploitation status as none, but the Technical Impact rating is total, meaning successful exploitation fully compromises the affected system.
Technical ContextAI
Spaceport.sys is the Windows kernel-mode driver that underpins the Storage Spaces virtualization feature, managing I/O routing between virtual disk abstractions and physical storage media. CWE-190 (Integer Overflow or Wraparound) describes a root cause where arithmetic on fixed-width integers exceeds the type's maximum value, silently wrapping to a small or zero value. In a kernel driver context, this typically produces miscalculated buffer sizes or array indices, leading to out-of-bounds memory writes or reads that can be weaponized to overwrite kernel control structures. The physical attack vector (AV:P in the CVSS vector) suggests the overflow is reachable through a device-local interface - such as a locally attached storage device, a IOCTL call requiring physical console access, or a specially crafted storage payload delivered through a directly connected medium - rather than over the network. Affected CPEs span Microsoft Windows 10 versions 1607, 1809, 21H2, and 22H2; Windows 11 versions 24H2, 25H2, and 26H1; and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025.
RemediationAI
Apply the Microsoft-released cumulative update addressing CVE-2026-50298, available through Windows Update and the Microsoft Update Catalog as referenced in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50298. Target builds per platform are: Windows 10 1607 / Server 2016 - 10.0.14393.9339 or later; Windows 10 1809 / Server 2019 - 10.0.17763.9020 or later; Windows 10 21H2 - 10.0.19044.7548 or later; Windows 10 22H2 - 10.0.19045.7548 or later; Windows 11 24H2 - 10.0.26100.8875 or later; Windows 11 25H2 - 10.0.26200.8875 or later; Windows 11 26H1 - 10.0.28000.2269 or later; Server 2012 - 6.2.9200.26226 or later; Server 2012 R2 - 6.3.9600.23291 or later; Server 2022 - 10.0.20348.5386 or later; Server 2025 - 10.0.26100.33158 or later. Where patching is temporarily delayed, enforce strict physical access controls: lock server rooms, use cable locks for laptops, enable chassis intrusion detection, and disable unused local storage device ports via UEFI/BIOS policy to reduce the attack surface. Note that disabling Storage Spaces entirely is a more aggressive mitigation but will break any workloads relying on that feature.
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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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