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
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. There is no public exploit identified at time of analysis and the flaw is not listed in CISA KEV, but Microsoft has released a patch.
Technical ContextAI
The vulnerability resides in the Windows USB Hub Driver, a kernel-mode component (usbhub.sys family) responsible for enumerating and managing USB devices and their downstream ports. The root cause is CWE-822 (Untrusted Pointer Dereference): the driver dereferences a pointer whose value is derived from data the attacker can influence - for example a value supplied through an IOCTL, device descriptor, or user-controlled buffer - without validating that it points to expected kernel memory. Because the code runs in kernel context, a controlled dereference can corrupt kernel state and be leveraged for arbitrary code execution or a controlled write/read primitive. The affected CPE set spans Windows 10 version 1809/21H2/22H2 and Windows Server 2019, 2022, and 2025 including Server Core installations, indicating shared driver code across the modern Windows kernel line.
RemediationAI
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. Because this is a kernel driver flaw with no vendor-published workaround in the provided data, there is no reliable configuration mitigation; as compensating controls until patching, restrict interactive and RDP logon rights so untrusted users cannot obtain a local session on sensitive servers (trade-off: may disrupt legitimate multi-user/terminal-server workflows), and where practical restrict physical/USB access on high-value endpoints via device-installation Group Policy or USB port control (trade-off: can break legitimate peripheral use). These controls reduce but do not eliminate exposure, so treat patching as the only complete fix.
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Same weakness CWE-822 – Untrusted Pointer Dereference
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today