EUVD-2026-44240
GHSA-g8r4-5q4c-44fv
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L) triggers a low-complexity kernel overflow with no interaction, yielding SYSTEM and full C/I/A impact in 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
Integer overflow or wraparound in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows NTFS file system driver allows an authenticated low-privileged user to gain SYSTEM-level rights by triggering an integer overflow (CWE-190) during filesystem processing. It affects a broad range of supported Windows client and server releases, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have local, authenticated access to the target host with at least low-level privileges (CVSS PR:L), and the ability to execute code locally that interacts with the NTFS file system to trigger the overflow; there is no network vector and no victim interaction is required (AV:L, UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.8 (High) and describes a realistic, high-value local privilege escalation: local vector, low complexity, low privileges required, no user interaction, unchanged scope, and full high impact to confidentiality, integrity, and availability - the canonical profile of a kernel EoP used as a second stage after initial access. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged foothold on a Windows host - for example via phishing, a compromised service account, or a standard user session on a shared server - runs a crafted local program that drives NTFS into the vulnerable size calculation, triggering the integer overflow and corrupting kernel memory to elevate to SYSTEM. Given AC:L and no required user interaction, exploitation is straightforward once local access exists, though a working exploit would need to be developed since no public POC is identified at time of analysis. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-56182 for each affected SKU as listed in the MSRC guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56182, which enumerates the exact fixed build numbers per Windows version (exact fix builds not reproduced in this input, so consult the advisory for the precise KB and build for your release). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Windows 10 1607+, Windows 11, and Windows Server 2012-2025 systems and identify high-value targets (domain controllers, critical servers). …
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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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