CVE-2026-68993 in Exynos 1480
Summary
by MITRE • 11/05/2026
A double free vulnerability in NPU driver due to improper pointer management (940)
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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 operating system or embedded platform. This specific issue is classified as a Double Free condition, which falls under the Common Weakness Enumeration category CWE-415. The root cause lies in improper pointer management by the developer responsible for writing the kernel-level code that interfaces with the hardware accelerator. In standard memory allocation paradigms, when a block of dynamic memory is allocated and subsequently released back to the system heap via a free operation, the pointer should ideally be nullified or otherwise managed to prevent subsequent access. However, in this instance, the driver fails to properly track the state of these pointers after an initial deallocation event. This oversight allows for multiple consecutive calls to release the same memory address, leading to undefined behavior within the kernel space where such operations are executed with high privileges and minimal runtime checks compared to user-space applications.
From a technical perspective, double free vulnerabilities exploit the internal data structures used by the heap allocator, such as metadata fields that track chunk sizes and allocation status. When the first free operation occurs, these metadata entries are updated to reflect that the memory block is available for reuse. If the same pointer is freed again without being reset or validated against a null state, the allocator may interpret this second request as an attempt to allocate new memory in a location it believes is already free, or worse, corrupt adjacent heap structures during its internal housekeeping processes. This corruption can manifest immediately through system crashes and kernel panics due to stack overflows or invalid pointer dereferences. More dangerously, however, sophisticated attackers can leverage the predictable nature of heap metadata manipulation to achieve arbitrary code execution. By carefully crafting inputs that trigger this double free condition in a controlled manner, an attacker can overwrite function pointers or other critical data structures within the kernel memory space, effectively gaining control over the instruction flow of the operating system.
The operational impact of this vulnerability is severe due to its location within the NPU driver. Neural Processing Units are increasingly central to modern computing tasks involving artificial intelligence and machine learning workloads, meaning they are frequently accessed by various applications ranging from web browsers to specialized analytics tools. If an attacker can trigger this flaw through a local application that utilizes the NPU for processing data, it constitutes a Local Privilege Escalation vector. This means that any user account with access to the relevant APIs or hardware interfaces could potentially exploit the bug to escalate their privileges to those of the system administrator or root level. Once elevated privileges are obtained, the attacker gains unrestricted read and write access to all files on the system, can install persistent backdoors, disable security logging mechanisms, and pivot to attack other systems within the network infrastructure. The presence of this flaw significantly lowers the barrier for entry in environments where NPU acceleration is enabled by default or required for performance-critical applications.
Mitigation strategies must address both immediate remediation and long-term defensive coding practices. The primary solution involves updating the NPU driver software to a patched version provided by the vendor, which should include rigorous validation checks before any memory deallocation occurs. Developers must ensure that pointers are set to null immediately after being freed and implement reference counting mechanisms where appropriate to prevent premature or duplicate releases. For organizations unable to patch immediately due to compatibility constraints, mitigating controls such as enabling Kernel Address Space Layout Randomization can help reduce the likelihood of successful exploitation by making it harder for attackers to predict memory addresses. Additionally, restricting access to NPU hardware interfaces through strict file permissions and mandatory access control policies like SELinux or AppArmor can limit the attack surface available to potential local adversaries. Continuous monitoring for anomalous kernel behavior and heap corruption indicators in system logs is also recommended as a detection mechanism while patching efforts are underway.