CVE-2026-65083 Overview
CVE-2026-65083 affects NVIDIA OpenShell for Linux. The flaw resides in the sandbox provisioning API, where an incomplete list of disallowed inputs [CWE-184] can be triggered by an attacker. Successful exploitation may lead to code execution, privilege escalation, information disclosure, data tampering, and denial of service. The issue is network-reachable and requires only low-privileged access, with a scope change that impacts resources beyond the vulnerable component.
Critical Impact
An authenticated attacker can bypass the sandbox provisioning API denylist, breaking out of the sandbox boundary to execute code, escalate privileges, disclose sensitive data, tamper with data, or trigger denial of service.
Affected Products
- NVIDIA OpenShell for Linux (sandbox provisioning API component)
Discovery Timeline
- 2026-08-25 - CVE-2026-65083 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-65083
Vulnerability Analysis
CVE-2026-65083 is an incomplete denylist vulnerability [CWE-184] in the NVIDIA OpenShell for Linux sandbox provisioning API. The API relies on a curated set of disallowed inputs to block dangerous provisioning operations. Because the list is incomplete, an attacker can supply inputs that evade the filter and reach sensitive code paths inside the sandbox provisioning workflow.
Exploitation is network-accessible and requires only low-privileged credentials. The scope changes when the flaw is triggered, meaning the impact extends outside the security boundary of the sandbox itself. Successful exploitation can produce code execution, privilege escalation, information disclosure, data tampering, and denial of service on the host.
Root Cause
The root cause is reliance on a denylist for input validation. Denylists are prone to bypass whenever new or semantically equivalent inputs are not represented in the filter. The NVIDIA advisory confirms that the disallowed-inputs list is incomplete, allowing crafted requests to pass validation and reach privileged sandbox provisioning logic. See the NVIDIA Product Security Advisory for vendor detail.
Attack Vector
The attacker sends crafted requests to the sandbox provisioning API from the network. The attacker needs low-privileged access to the API but no user interaction. Because scope changes on exploitation, the attacker can influence host-side components managed by the sandbox provisioning subsystem, breaking isolation guarantees. No public proof-of-concept or in-the-wild exploitation has been reported. Technical mechanics beyond the vendor summary are not publicly documented; refer to the NIST CVE-2026-65083 Detail for the authoritative record.
Detection Methods for CVE-2026-65083
Indicators of Compromise
- Unexpected sandbox provisioning API requests originating from low-privileged accounts or unusual source addresses.
- Sandbox worker processes spawning child processes outside the sandbox's expected process tree.
- New or modified files, services, or systemd units created by the sandbox provisioning service account.
- Outbound network connections initiated by sandboxed workloads to attacker-controlled infrastructure.
Detection Strategies
- Audit sandbox provisioning API logs for requests containing input patterns not represented in the historical baseline.
- Correlate API calls with process, file, and network telemetry from the sandbox host to identify scope-change behavior.
- Alert on privilege transitions inside the OpenShell sandbox provisioning service to root or other privileged contexts.
Monitoring Recommendations
- Forward OpenShell API and system logs to a centralized analytics platform with retention aligned to incident response needs.
- Monitor for anomalous NVIDIA driver, GPU management, or OpenShell service activity on Linux hosts running the affected component.
- Track authentication events on accounts that hold access to the sandbox provisioning API and flag unusual usage.
How to Mitigate CVE-2026-65083
Immediate Actions Required
- Apply the fixed release identified in the NVIDIA Product Security Advisory as soon as it is available in your change window.
- Inventory Linux hosts running NVIDIA OpenShell and confirm exposure of the sandbox provisioning API.
- Restrict access to the sandbox provisioning API to trusted management networks and rotate credentials that had access.
- Review authentication and API access logs for suspicious activity prior to patch deployment.
Patch Information
NVIDIA has published guidance and fix details in the NVIDIA Product Security Advisory. Administrators should follow the vendor advisory for specific fixed versions and upgrade procedures. Refer to the CVE.org Record for CVE-2026-65083 for the canonical CVE entry.
Workarounds
- Place the sandbox provisioning API behind a network segmentation boundary that permits only trusted administrative sources.
- Enforce least privilege on accounts authorized to call the provisioning API and remove unused credentials.
- Disable or stop the OpenShell sandbox provisioning service on hosts where it is not required until patching completes.
# Configuration example: restrict access to the OpenShell sandbox provisioning API
# Replace 10.10.0.0/24 with your trusted management network and adjust the port as required
sudo iptables -A INPUT -p tcp --dport <openshell_api_port> -s 10.10.0.0/24 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport <openshell_api_port> -j DROP
# Optional: stop the service on hosts where it is not needed
sudo systemctl stop nvidia-openshell.service
sudo systemctl disable nvidia-openshell.service
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
