CVE-2026-47624: NVIDIA DGX Spark UEFI Auth Bypass Flaw

CVE-2026-47624 Overview

CVE-2026-47624 is a UEFI firmware vulnerability in NVIDIA DGX Spark systems. The flaw is categorized as [CWE-693] Protection Mechanism Failure. A privileged local user can exploit the weakness to bypass administrator password protection in UEFI.

The issue affects the firmware protection logic that enforces administrator password checks. Successful exploitation allows an attacker with high local privileges to modify UEFI settings that should be gated by the administrator password. This impacts firmware integrity without directly exposing confidential data or causing service disruption.

Critical Impact
A privileged local user can bypass UEFI administrator password protection on NVIDIA DGX Spark, enabling unauthorized modification of firmware configuration.

Affected Products

NVIDIA DGX Spark (UEFI firmware)

Discovery Timeline

2026-08-25 - CVE-2026-47624 published to NVD
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-47624

Vulnerability Analysis

The vulnerability resides in the UEFI firmware shipped with NVIDIA DGX Spark. UEFI implements an administrator password to gate access to sensitive firmware configuration. In this case, the protection mechanism fails to correctly enforce that check under specific conditions.

An attacker who already holds high privileges on the local operating system can leverage the flaw to reach protected UEFI functionality. Because the scope changes across a trust boundary, the impact extends beyond the initially compromised component. The primary consequence is loss of firmware configuration integrity.

There are no confidentiality or availability impacts reported for this issue. No public exploit code is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is a Protection Mechanism Failure [CWE-693] in UEFI. The firmware relies on an administrator password check to authorize privileged configuration changes. That check can be bypassed, allowing operations that should require the administrator credential to proceed without it.

Attack Vector

Exploitation requires local access with high privileges on the DGX Spark host. No user interaction is required. Because the attacker acts against UEFI from the operating system layer, the scope crosses from OS to firmware, letting an authorized OS administrator gain unauthorized control over UEFI settings.

No verified proof-of-concept code has been published. See the NVIDIA product security advisory for technical details.

Detection Methods for CVE-2026-47624

Indicators of Compromise

Unexpected changes to UEFI settings, boot order, or Secure Boot state on DGX Spark systems.
Firmware audit logs showing administrator-gated configuration changes without corresponding password entry events.
Unscheduled or unauthorized invocations of UEFI configuration utilities from privileged OS accounts.

Detection Strategies

Compare current UEFI configuration against a signed known-good baseline for each DGX Spark host.
Monitor privileged local sessions for execution of firmware management tools such as efibootmgr, fwupd, or vendor-supplied UEFI utilities.
Alert on modifications to EFI variables under /sys/firmware/efi/efivars/ that alter security-relevant settings.

Monitoring Recommendations

Ingest OS audit logs and firmware change events into a centralized SIEM for correlation across the DGX fleet.
Track use of root or equivalent accounts on DGX Spark hosts and flag activity that touches UEFI interfaces.
Validate Secure Boot state and measured boot values (PCR readings) at regular intervals and after reboots.

How to Mitigate CVE-2026-47624

Immediate Actions Required

Inventory all NVIDIA DGX Spark systems and identify current UEFI firmware versions.
Restrict local privileged access on DGX Spark hosts to a minimal set of administrators.
Enable and monitor Secure Boot, measured boot, and platform attestation where supported.
Apply the firmware update from NVIDIA as soon as it is available for your platform.

Patch Information

Refer to the NVIDIA product security bulletin for CVE-2026-47624 for the authoritative list of fixed firmware versions and update instructions. Additional metadata is available in the NVD entry for CVE-2026-47624 and the CVE.org record.

Workarounds

Limit shell and remote administrative access to DGX Spark systems to trusted operators only.
Enforce multi-person approval for firmware and BIOS configuration changes.
Physically secure DGX Spark hardware and restrict console access.
Continuously verify UEFI configuration and Secure Boot state against a signed baseline until patched firmware is deployed.

bash

# Example: verify Secure Boot state and capture a UEFI configuration baseline on Linux
mokutil --sb-state
efibootmgr -v > /var/log/uefi-boot-baseline-$(date +%F).txt
sha256sum /sys/firmware/efi/efivars/* 2>/dev/null > /var/log/uefi-vars-baseline-$(date +%F).txt