EUVD-2026-44239
GHSA-fc99-9g2v-hx8x
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing low-privileged local session (AV:L/PR:L), triggers reliably without user interaction (AC:L/UI:N), and yields SYSTEM-level kernel code execution (C:H/I:H/A:H).
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
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows NTFS driver lets an already-authenticated attacker corrupt heap memory to run code at a higher privilege level (typically SYSTEM) on affected Windows 10, Windows 11, and Windows Server builds. Microsoft reported the issue and has shipped a fix; there is no public exploit identified at time of analysis and it 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 already have local, authenticated code-execution as a low-privileged user on the target Windows host (CVSS PR:L, AV:L) - this is a second-stage privilege-escalation bug, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent and point to a genuine but not emergency-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a standard (non-admin) user session - for example via phishing malware or a compromised service account - invokes the vulnerable NTFS code path with crafted input that overflows a kernel heap buffer. By grooming the heap and corrupting adjacent kernel structures, they escalate to SYSTEM and disable defenses or install persistence. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft cumulative update for your specific Windows/Windows Server build as listed in the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56175, which provides the exact patched build number for each affected SKU (no single cross-SKU version string is published). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems, prioritizing domain-joined infrastructure and workstations used by privileged accounts. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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