EUVD-2026-43909
GHSA-vq5w-gmhq-wgw3
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 use-after-free with no interaction, escalating to SYSTEM for full C/I/A impact within 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
Use after free in Windows DirectX allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows DirectX graphics kernel subsystem allows an authenticated attacker to elevate to SYSTEM by triggering a use-after-free (CWE-416) memory-corruption condition across Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025. The CVSS 3.1 vector (7.8, AV:L/PR:L) confirms local access and low existing privileges are required with no user interaction, yielding full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local code-execution on the target (PR:L) - a standard user account or an existing malware foothold is sufficient; no administrative rights and no user interaction (UI:N) are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are consistent and point to a genuinely actionable local EoP rather than an inflated high-CVSS issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows 11 24H2 workstation - for example via a phishing-delivered user-context malware or a compromised standard account - runs a crafted program that repeatedly exercises the vulnerable DirectX kernel path to trigger the use-after-free and groom kernel memory. By reallocating the freed object with attacker-controlled data, they corrupt kernel state to execute code as SYSTEM, then disable defenses and move laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50353 via Windows Update or WSUS/Intune; the fix is delivered as part of the corresponding monthly cumulative update for each affected build (Patch available per vendor advisory - confirm the exact patched build for your OS at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50353). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and enumerate all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems in the environment using asset management tools. …
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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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