EUVD-2026-44088
GHSA-q948-5m38-h2rm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user triggers a kernel driver flaw with no user interaction, yielding SYSTEM-level compromise, so AV:L/PR:L and full C/I/A high.
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
Untrusted pointer dereference in Windows USB Hub Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows USB Hub Driver allows an authenticated low-privileged user to elevate to SYSTEM by triggering an untrusted pointer dereference (CWE-822), affecting Windows 10 (1809/21H2/22H2) and Windows Server 2019 through 2025. Successful exploitation yields full confidentiality, integrity, and availability impact on the local host. …
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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 (CVSS AV:L with PR:L) - this is a local elevation-of-privilege flaw, not remotely reachable, so a foothold on the machine is the mandatory precondition. … 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 (base 7.8, High) describes a locally exploitable flaw of low attack complexity requiring low privileges and no user interaction, with high impact to all three security properties within an unchanged scope - a classic local elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example through phishing, a compromised service account, or a standard user on a shared terminal server - runs a crafted program that issues malicious requests to the USB Hub Driver, triggering the untrusted pointer dereference in kernel context. By controlling the dereferenced pointer they corrupt kernel memory to gain SYSTEM privileges, then disable security tooling and move laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50479 (Patch available per vendor advisory) via Windows Update or WSUS/SCCM/Intune for every affected SKU - Windows 10 1809/21H2/22H2 and Windows Server 2019/2022/2025 including Server Core - using the exact per-version fixed build listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50479; the referenced data does not disclose a single fixed version number, so consult that advisory for the build that matches each host. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10 (versions 1809, 21H2, 22H2) and Windows Server 2019-2025 systems across the organization; prioritize domain-joined systems and servers containing sensitive data. …
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Information Disclosure
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External POC / Exploit Code
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