CVE-2026-68994 in Exynos 1480
Summary
by MITRE • 11/05/2026
A double free vulnerability in NPU driver due to improper pointer management (941)
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Analysis
by VulDB Data Team • 11/05/2026
The identified vulnerability represents a critical memory corruption flaw within the Neural Processing Unit, or NPU, driver subsystem of the affected software environment. This specific issue is classified as a Double Free error, which corresponds directly to Common Weakness Enumeration identifier CWE-415. The root cause lies in improper pointer management practices employed during the lifecycle of dynamic memory allocation and deallocation routines within the kernel-space driver code. In standard operating procedures for device drivers, when resources such as buffers or control structures are allocated on the heap, they must be freed exactly once upon completion of their utility to prevent resource leaks or corruption. However, in this instance, the logic governing these operations fails to properly track the state of pointers after an initial deallocation event occurs. This oversight allows subsequent code paths to invoke a free operation on memory addresses that have already been returned to the system allocator, thereby triggering the double free condition.
From a technical perspective, the heap manager relies heavily on metadata associated with allocated blocks to maintain integrity and track available space for future allocations. When a pointer is freed twice, the first invocation correctly updates these internal structures to mark the block as free. The second invocation attempts to process this same memory region again, causing the allocator's data structures to become corrupted. This corruption can manifest in various ways depending on the state of the heap at the time of exploitation. It may lead to immediate system instability or a kernel panic due to invalid pointer dereferences during subsequent allocation requests. More critically, it creates an opportunity for sophisticated attackers to manipulate the heap layout through techniques such as heap spraying or targeted overwrites. By carefully controlling what data is written into the freed memory regions before they are reallocated, an attacker can achieve arbitrary code execution with the privileges of the kernel process, effectively gaining full control over the host system.
The operational impact of this vulnerability extends beyond simple application crashes to severe security compromises affecting the integrity and availability of systems utilizing NPU-accelerated workloads. Since drivers operate at ring 0 or equivalent high-privilege levels in most architectures, exploitation results in complete loss of confidentiality for sensitive data processed by the device, including potentially biometric templates, image recognition models, or proprietary algorithmic outputs. Furthermore, an attacker could use this flaw to bypass security mechanisms such as kernel patch protection or memory enforcement policies like DEP and ASLR if they can control the heap metadata sufficiently. The presence of this vulnerability in a driver component is particularly concerning because drivers are often loaded early in the boot process and remain resident for the duration of system uptime, providing a persistent attack surface that does not require user interaction to trigger if accessible via device interfaces or remote APIs exposed by higher-level services.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary solution involves applying vendor-provided patches that correct the pointer management logic within the NPU driver source code. These updates typically introduce reference counting mechanisms, nullify pointers immediately after freeing them to prevent subsequent access, or implement strict state machines that track whether a resource is currently active or released. In addition to patching, organizations should enforce least-privilege principles by ensuring that user-space applications interacting with the NPU do not have unnecessary elevated permissions. Implementing robust input validation and fuzz testing during development phases can help identify similar logic errors before deployment. Security teams should also monitor for indicators of compromise associated with heap exploitation techniques, such as unusual patterns in kernel memory usage or unexpected privilege escalation events, to detect potential attempts to leverage this vulnerability in the wild while patches are being deployed across infrastructure.