CVE-2026-47626 Overview
CVE-2026-47626 is an out-of-bounds write vulnerability [CWE-787] in the NVIDIA DGX Spark system firmware. A privileged local attacker can trigger the flaw to write outside the bounds of an allocated firmware buffer. Successful exploitation can lead to arbitrary code execution, privilege escalation, denial of service, information disclosure, and data tampering within the affected system.
The vulnerability affects the firmware layer, which means impact extends below the operating system boundary and crosses privilege scopes. NVIDIA published the advisory in its product-security GitHub repository under advisory 5867.
Critical Impact
A privileged local attacker can achieve firmware-level code execution on DGX Spark systems, bypassing OS-level security controls and enabling persistent compromise.
Affected Products
- NVIDIA DGX Spark system firmware
- See the NVIDIA product security advisory 5867 for exact affected firmware versions
- Review the NVD entry for CVE-2026-47626 for updated CPE data
Discovery Timeline
- 2026-08-25 - CVE-2026-47626 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-47626
Vulnerability Analysis
The vulnerability is an out-of-bounds write [CWE-787] in NVIDIA DGX Spark system firmware. Out-of-bounds writes occur when code writes data past the end, or before the beginning, of an allocated buffer. In firmware contexts, this class of flaw commonly corrupts adjacent structures, function pointers, or SMM/UEFI runtime data.
Exploitation requires local access with high privileges, which typically means a compromised administrator account or an operator with authorized code-execution paths into firmware interfaces. Because the vulnerability sits in firmware, the scope of impact changes: an attacker who succeeds can subvert components that the operating system trusts implicitly.
Successful exploitation can produce five distinct outcomes: arbitrary code execution within the firmware context, escalation of privilege beyond the operating system boundary, denial of service through firmware corruption, disclosure of memory contents that traverse the firmware layer, and tampering with data structures used at boot or runtime.
Root Cause
The root cause is missing or insufficient bounds validation on data written to a firmware buffer. When attacker-controlled input reaches the vulnerable write operation, the code proceeds without verifying that the destination offset and length remain within the allocated region. NVIDIA has not publicly disclosed the specific firmware component or interface path.
Attack Vector
The attack requires local access and high privileges, with no user interaction. An attacker who already holds elevated rights on the host issues firmware interactions that reach the vulnerable code path. Because the scope changes on exploitation, the resulting compromise affects components outside the initial privilege boundary, enabling persistent, below-OS control of the DGX Spark platform.
No public proof-of-concept exploit is available, and CISA has not added CVE-2026-47626 to the Known Exploited Vulnerabilities catalog. See the NVIDIA product security repository entry for vendor-supplied technical details.
Detection Methods for CVE-2026-47626
Indicators of Compromise
- Unexpected firmware version changes or firmware update events outside of scheduled maintenance windows on DGX Spark hosts.
- Kernel or driver logs showing unusual firmware interface calls, SMI activity, or vendor management interface access from non-standard processes.
- Unexplained system instability, reboots, or hardware watchdog events following administrative sessions.
Detection Strategies
- Establish a firmware measurement baseline for DGX Spark systems and alert on hash or version deviations.
- Monitor privileged account usage on DGX Spark hosts, particularly command executions that interact with firmware update utilities or vendor management tooling.
- Correlate administrative logons with subsequent firmware, IPMI, or BMC-adjacent activity to identify anomalous sequences.
Monitoring Recommendations
- Ingest DGX Spark system logs, IPMI logs, and firmware update audit trails into a centralized analytics platform for retention and correlation.
- Enable integrity monitoring on firmware update binaries and vendor management agents.
- Track privileged shell sessions on DGX Spark hosts and preserve command history for forensic review.
How to Mitigate CVE-2026-47626
Immediate Actions Required
- Inventory all NVIDIA DGX Spark systems and identify current firmware versions.
- Apply the firmware update referenced in the NVIDIA product security advisory 5867 as soon as it is available in your environment.
- Restrict administrative access to DGX Spark hosts to a minimal set of named operators and enforce multi-factor authentication for those accounts.
- Audit recent privileged activity on DGX Spark systems for signs of firmware interaction before patches are deployed.
Patch Information
NVIDIA has published advisory 5867 covering CVE-2026-47626. Consult the NVIDIA product-security repository for fixed firmware versions, download locations, and update procedures specific to DGX Spark. Follow NVIDIA's documented firmware update workflow and validate integrity of update packages before flashing.
Workarounds
- Limit local privileged access on DGX Spark systems to reduce the population of accounts capable of triggering the vulnerable code path.
- Segment DGX Spark management interfaces onto isolated administrative networks with strict jump-host controls.
- Enable and monitor auditing on firmware update utilities and vendor management tooling until firmware patches are applied.
# Example: list active administrative sessions and recent sudo activity on a Linux-based DGX host
who
last -n 50
sudo journalctl _COMM=sudo --since "7 days ago"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
