EUVD-2026-44256
GHSA-2wqv-j5pw-q5fx
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requires prior low-privileged code execution (AV:L, PR:L) with no user interaction; kernel-mode compromise yields full C/I/A impact within the unchanged local 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
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an authenticated attacker to elevate to SYSTEM by exploiting a use-after-free (CWE-416) memory corruption condition, spanning Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2016 through 2025. Reported by Microsoft with a CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N), the flaw grants full confidentiality, integrity, and availability impact on the local system. …
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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 access to the target with the ability to execute code as a low-privileged user (CVSS PR:L, AV:L) - it cannot be triggered remotely or by an unauthenticated party. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, score 7.8 High) is internally consistent with the description of local privilege escalation: exploitation requires local access and low existing privileges but no user interaction, and yields high impact across the CIA triad. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows host - for example through a phishing payload, a malicious document macro, or a compromised standard user account - runs a crafted local program that triggers the use-after-free in the kernel, grooms the freed allocation, and hijacks the stale pointer to execute code in kernel mode, elevating to SYSTEM. No user interaction is required and the technique is fully local. … |
| Remediation | Apply the Microsoft cumulative security update that addresses CVE-2026-56644 for each affected build; the exact fixed build numbers are enumerated per product on the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56644 (Patch available per vendor advisory - install the latest monthly cumulative update for your Windows 10, Windows 11, or Windows Server version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1607-22H2), Windows 11 (versions 24H2/25H2/26H1), and Windows Server 2016-2025 systems; identify which systems cannot tolerate patching windows and segregate them for priority remediation. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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