Description

An issue was discovered in the buffer queue driver in Samsung Automotive Processor Exynos Auto 8890, V7, V9, and V920. Lack of a length check leads to a Denial of Service in the kernel.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.7",
  "pubDate": "2026-09-14T00:16:55.880Z",
  "pubdate": "2026-09-14T00:16:55.880Z",
  "executiveSummary": "A critical vulnerability exists within the buffer queue driver utilized across several Samsung Automotive Processors, including the Exynos Auto 8890, V7, V9, and V920.\nThe vulnerability is characterized by a lack of input validation, specifically an improper bounds check on the length of incoming data packets handled by the driver.\nThis flaw enables a Denial of Service (DoS) attack, where a malicious actor can trigger a kernel-level failure, resulting in system instability or a complete crash of the affected processor.\nThe vulnerability resides within kernel space, meaning successful exploitation requires an attacker to possess the capability to interface with the driver directly.\nGiven the context of automotive processors, such an exploit could potentially disrupt critical vehicle functions managed by these SoCs.\nThe risk implication is high, as the kernel panic caused by this buffer manipulation could lead to unpredictable behavior in safety-critical automotive systems.",
  "technicalDetails": "The vulnerability originates in the kernel-space buffer queue driver component responsible for managing data structures in Samsung Exynos Auto 8890, V7, V9, and V920 platforms.\nThe root cause is identified as an insufficient validation mechanism concerning the length field of data buffers processed by the driver. When the driver receives a request, it fails to verify that the length parameter provided by the user-space or peripheral source corresponds to the actual allocated memory space intended for the buffer.\nThis lack of bounds checking facilitates a buffer overflow condition within the kernel memory space. An attacker can craft a malicious input with a length parameter that exceeds the designated buffer size. When the driver attempts to process or copy this data into the buffer queue without proper size constraints, it results in memory corruption.\nThe exploitation flow typically begins with an attacker gaining initial access or interfacing with the driver interface. By supplying a specially crafted payload with an excessive length value, the attacker bypasses the internal bounds verification. The kernel, upon attempting to handle the oversized memory write, triggers an exception.\nSince this operation occurs within the kernel context, the subsequent memory corruption leads to a kernel panic. The operating system's inability to safely handle this illegal memory access forces a system-wide halt to prevent further data corruption or unauthorized code execution, effectively resulting in a Denial of Service.\nBecause the vulnerable component operates at a high privilege level (kernel), the exploit can be triggered by any entity capable of sending data to the buffer queue driver. There is no indication that specialized authentication is required if the driver interface is exposed to a malicious source. The impact is significant, as a kernel panic in an automotive processor can lead to the loss of availability for systems that depend on the SoC for real-time processing and decision-making.\nPost-exploitation impact is limited to system downtime and service disruption; however, the lack of input sanitization provides a clear path for attackers to reliably trigger an unrecoverable system state."
}