EUVD-2026-44129
GHSA-m4mq-5mc2-xrjv
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Local authenticated foothold (AV:L/PR:L), race-like preconditions give AC:H, no victim interaction (UI:N); kernel compromise crossing the security boundary gives S:C with full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Null pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel lets an authenticated attacker gain elevated (SYSTEM-level) privileges by triggering a NULL pointer dereference (CWE-476) in kernel-mode code. The flaw affects a broad range of client and server builds from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be a locally authenticated, low-privileged user on the affected Windows system (CVSS PR:L, AV:L) and to execute code that reaches the vulnerable kernel code path; no victim user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H: exploitation is local and already-authenticated (PR:L), requires high attack complexity (AC:H, suggesting a race or specific timing/state condition), needs no user interaction, and via a scope change (S:C) yields full confidentiality, integrity, and availability impact, i.e. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has valid low-privileged credentials on a Windows host - for example via phishing, a compromised service account, or a shared terminal server - runs a crafted local program that repeatedly invokes the vulnerable kernel path to win the timing/state window (AC:H) and trigger the NULL pointer dereference. Successful exploitation elevates the process to kernel/SYSTEM privileges, enabling credential theft, driver/tool installation, and persistence. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50673 for your specific Windows build via Windows Update or WSUS/SCCM, using the per-version KB listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50673 (exact fixed build numbers were not included in the provided data - do not assume a version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Use your asset management system to identify and document all endpoints running Windows 10 (version 1607 and later), Windows 11 (through version 26H1), Windows Server 2012 through Windows Server 2025. …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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