CVE-2022-32609 in Android
Summary
by MITRE • 11/09/2022
In vcu, there is a possible use after free due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07203410; Issue ID: ALPS07203410.
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Analysis
by VulDB Data Team • 05/30/2026
The vulnerability identified as CVE-2022-32609 represents a critical use-after-free condition within the vcu component of a system, exploiting a race condition that enables local privilege escalation. This flaw resides in the kernel-level subsystem responsible for video codec unit operations and demonstrates how improper memory management can create persistent security weaknesses. The vulnerability manifests when concurrent access patterns in the vcu module allow for a freed memory region to be accessed after the original allocation has been released, creating a scenario where arbitrary code execution becomes possible. The race condition occurs during the handling of multiple simultaneous requests to the video codec unit, where the timing of memory deallocation and subsequent access creates a window for exploitation. This particular flaw requires system execution privileges for exploitation, indicating that an attacker must already have some level of access to the system before leveraging this vulnerability. The absence of user interaction requirements makes this vulnerability particularly dangerous as it can be exploited automatically without any human intervention, potentially allowing attackers to gain elevated privileges through automated attack vectors.
The technical implementation of this vulnerability stems from inadequate synchronization mechanisms within the vcu subsystem, where multiple threads or processes can access shared resources without proper mutual exclusion controls. When the vcu module processes video encoding or decoding requests, it allocates memory structures to handle the operations and subsequently frees them when processing completes. However, the race condition allows for a scenario where one thread frees a memory block while another thread simultaneously attempts to access that same memory location, resulting in a use-after-free condition. This memory corruption creates opportunities for attackers to manipulate the execution flow of the system by overwriting critical data structures or function pointers within the freed memory space. The vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions, and demonstrates how improper resource management can lead to privilege escalation. The attack vector operates at the kernel level where the vcu module executes with elevated privileges, making successful exploitation directly translate to system compromise. The patch ID ALPS07203410 indicates this was addressed through kernel-level fixes that implement proper synchronization mechanisms and memory management protocols to prevent the race condition from occurring.
The operational impact of CVE-2022-32609 extends beyond simple privilege escalation as it represents a fundamental weakness in the system's memory management and concurrency control mechanisms. Once exploited, this vulnerability allows attackers to gain system-level privileges without requiring user interaction, enabling them to execute arbitrary code with the highest possible system permissions. This capability can be leveraged to establish persistent backdoors, modify system files, disable security controls, or extract sensitive data from the compromised system. The local privilege escalation aspect means that attackers can potentially gain root access or equivalent system-level privileges, which would provide complete control over the affected device. The vulnerability's exploitation does not require any user interaction, making it particularly dangerous in environments where systems may be accessed by untrusted users or where automated attacks could be launched. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques such as kernel exploits and race condition exploitation, where adversaries can leverage system-level weaknesses to gain elevated access. The impact is particularly severe in mobile or embedded systems where vcu modules are commonly found, as these platforms often lack robust security controls and may be deployed in environments with limited monitoring capabilities.
Mitigation strategies for CVE-2022-32609 should focus on implementing comprehensive memory safety controls and ensuring proper synchronization mechanisms are in place within the vcu subsystem. The recommended approach includes applying the official patch ALPS07203410 which addresses the underlying race condition through proper locking mechanisms and memory management protocols. System administrators should also consider implementing runtime protections such as address space layout randomization and stack canaries to make exploitation more difficult even if the vulnerability is not patched. Additionally, monitoring for unusual memory access patterns and concurrent thread behaviors in the vcu module can help detect potential exploitation attempts. Security configurations should enforce strict access controls on vcu resources and implement proper input validation to prevent malformed requests from triggering the race condition. Organizations should also conduct regular security assessments of kernel modules and implement automated patch management processes to ensure timely deployment of security fixes. The vulnerability highlights the importance of proper concurrency control in kernel-level code and underscores the need for rigorous security testing of system components that handle concurrent access patterns. Regular vulnerability scanning and security audits should be performed to identify similar race condition vulnerabilities in other system components and ensure comprehensive protection against similar exploitation techniques.