CVE-2017-8266 in Android
Summary
by MITRE
In all Qualcomm products with Android releases from CAF using the Linux kernel, a race condition exists in a video driver potentially leading to a use-after-free condition.
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Analysis
by VulDB Data Team • 11/09/2019
The vulnerability identified as CVE-2017-8266 represents a critical race condition within Qualcomm's video driver implementation that affects numerous Android devices running Linux kernel-based systems. This flaw resides in the communication between the Android framework and the underlying kernel driver, specifically within the video processing subsystem that handles multimedia content. The vulnerability stems from improper synchronization mechanisms during concurrent access to shared memory resources, creating an environment where multiple processes or threads can attempt to access the same memory location simultaneously.
The technical exploitation of this race condition manifests as a potential use-after-free condition, where memory allocated to video processing operations is freed while still being referenced by other processes or threads. This scenario occurs when the video driver fails to properly coordinate access to kernel memory buffers during video decoding or encoding operations, particularly when multiple video streams are processed concurrently. The race condition typically emerges during the transition phases of video buffer allocation and deallocation, where timing dependencies between different kernel threads create opportunities for memory corruption. This vulnerability is classified under CWE-362, which specifically addresses race conditions in software systems, and falls within the broader category of improper synchronization issues that can lead to memory safety violations.
The operational impact of CVE-2017-8266 extends beyond simple memory corruption, as it can potentially enable privilege escalation and remote code execution on affected devices. Attackers who successfully exploit this vulnerability can manipulate the video driver to execute arbitrary code with kernel-level privileges, effectively compromising the entire device security model. The attack surface is particularly concerning given that this vulnerability affects all Qualcomm products utilizing Android with Linux kernel versions from the Common Android Framework, meaning millions of devices across various manufacturers could be impacted. This includes smartphones, tablets, and other mobile devices that rely on Qualcomm's Snapdragon processors for multimedia processing capabilities.
Mitigation strategies for CVE-2017-8266 require immediate patch deployment from device manufacturers and system administrators, as the vulnerability exists at the kernel driver level where traditional application-level protections are insufficient. The most effective remediation involves implementing proper mutex locking mechanisms and synchronization primitives within the video driver code to prevent concurrent access to shared memory resources. Security professionals should also consider implementing runtime monitoring solutions that can detect anomalous behavior patterns indicative of memory corruption attempts, particularly during video processing operations. Organizations should prioritize patch management processes to ensure timely deployment of Qualcomm's security updates and consider implementing network segmentation to limit potential attack vectors. The vulnerability demonstrates the critical importance of proper kernel-level synchronization in embedded systems and aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation' through kernel exploits. Additionally, this vulnerability underscores the necessity of comprehensive security testing for device drivers and the importance of adhering to secure coding practices that prevent race conditions in concurrent environments, as recommended by industry standards including the CERT Secure Coding Standards for kernel development.