CVE-2026-21399 Overview
CVE-2026-21399 is a heap-based buffer overflow in the Intel Open Volume Kernel Library (Intel Open VKL) affecting versions before 2.0.2. The flaw resides in Ring 3 user-space code and can be triggered by an authenticated local user. Successful exploitation results in denial of service against the affected application. The issue is classified under CWE-122: Heap-based Buffer Overflow and was published to the National Vulnerability Database (NVD) on 2026-08-11.
Critical Impact
An authenticated local attacker can trigger a heap-based buffer overflow in Intel Open VKL before 2.0.2, causing denial of service with high availability impact on the vulnerable process.
Affected Products
- Intel Open Volume Kernel Library (Intel Open VKL) versions prior to 2.0.2
- Applications and rendering pipelines that link against vulnerable Intel Open VKL builds
- Systems where Intel Open VKL runs in Ring 3 user-space contexts
Discovery Timeline
- 2026-08-11 - CVE-2026-21399 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-21399
Vulnerability Analysis
The vulnerability is a heap-based buffer overflow ([CWE-122]) in the Intel Open Volume Kernel Library, a component of the Intel oneAPI Rendering Toolkit used for volumetric data sampling in scientific visualization and ray tracing workloads. The overflow occurs within Ring 3 user-space code paths, meaning it does not require kernel privileges to reach. An authenticated local user with the ability to run applications linking Open VKL can supply crafted input that overruns a heap allocation. The result is memory corruption that terminates the vulnerable process, producing a denial of service condition with low integrity impact and high availability impact on the vulnerable component.
Root Cause
The root cause is improper bounds validation on heap-allocated buffers within Open VKL prior to version 2.0.2. When data supplied to a vulnerable code path exceeds the size assumed by the allocator, adjacent heap metadata or object data is overwritten. Intel's advisory categorizes this as a locally exploitable memory safety defect corrected in 2.0.2. Refer to the Intel Security Advisory SA-01459 for vendor confirmation.
Attack Vector
Exploitation requires local access and low-privilege authenticated credentials on the target host. No user interaction is required beyond invoking the vulnerable application. The attacker delivers malformed input, such as a crafted volume file or API argument, that reaches the vulnerable Open VKL routine. Because the confidentiality impact is rated none and integrity impact is low, the practical outcome is process crash rather than arbitrary code execution or data theft. The EPSS score is 0.114% as of 2026-08-13, indicating low observed exploitation probability.
// No verified public proof-of-concept is available.
// See Intel Security Advisory SA-01459 for vendor technical details.
Detection Methods for CVE-2026-21399
Indicators of Compromise
- Unexpected termination or crash dumps of processes linking Intel Open VKL libraries below version 2.0.2
- Heap corruption signatures such as malloc assertions, glibc double free or corruption, or Windows heap validation faults in Open VKL call stacks
- Anomalous volume, VDB, or structured data files submitted by low-privilege users to rendering or visualization pipelines
Detection Strategies
- Inventory installed Intel oneAPI Rendering Toolkit components and flag Open VKL builds earlier than 2.0.2
- Monitor application crash telemetry for repeated faults inside openvkl shared objects or DLLs
- Enable heap protection tooling such as AddressSanitizer or PageHeap in test environments to surface overflows early
Monitoring Recommendations
- Forward endpoint crash and process termination events to a centralized data lake for correlation across hosts
- Alert on repeated Open VKL process failures originating from the same user account within short time windows
- Track file writes and API calls to visualization workloads by non-administrative users
How to Mitigate CVE-2026-21399
Immediate Actions Required
- Upgrade Intel Open Volume Kernel Library to version 2.0.2 or later on all affected hosts
- Audit build systems and container images for bundled Open VKL binaries and rebuild against the patched library
- Restrict local logon and application execution privileges on workstations running rendering and visualization tooling
Patch Information
Intel has released Open VKL version 2.0.2 which remediates the heap-based buffer overflow. Consult the Intel Security Advisory SA-01459 for full version guidance and download locations. Redistribute patched binaries to any downstream applications, plugins, or SDK integrations that statically or dynamically link Open VKL.
Workarounds
- Limit execution of Open VKL-dependent applications to trusted users until patching is complete
- Validate and sanitize volumetric input files before passing them to Open VKL processing routines
- Isolate rendering workloads in sandboxed or containerized environments to constrain the blast radius of a crash
# Verify installed Open VKL version on Linux hosts
ldconfig -p | grep -i openvkl
strings /path/to/libopenvkl.so | grep -i version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
