CVE-2026-69043 in Exynos
Summary
by MITRE • 11/05/2026
In the Samsung Exynos GPU driver, improper synchronization during buffer object creation and closing can lead to memory corruption
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Analysis
by VulDB Data Team • 11/05/2026
The vulnerability resides within the kernel-space graphics processing unit subsystem of Samsung's Exynos SoC architecture, specifically affecting the management of buffer objects which serve as fundamental units for rendering operations. Buffer objects are critical data structures that map GPU-accessible memory regions used by applications and drivers to store textures, framebuffers, and other graphical assets. The core technical flaw involves a race condition arising from improper synchronization mechanisms during the lifecycle events of these buffers, particularly at the points of creation and closure. When multiple threads or processes attempt to allocate, reference, or release buffer objects concurrently without adequate locking primitives such as mutexes or spinlocks, the internal state management logic can become desynchronized. This lack of atomicity allows for scenarios where a buffer object might be freed while still being referenced by active rendering contexts or hardware queues, leading to use-after-free conditions or double-free errors within kernel memory space.
From an architectural perspective, this flaw aligns with CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization and CWE-416 Use After Free. The absence of robust synchronization primitives means that the driver fails to enforce mutual exclusion when modifying shared data structures associated with buffer objects. In a typical execution flow, if one thread initiates the destruction of a buffer object while another is in the process of mapping or accessing it for rendering commands, the memory backing that buffer may be reclaimed by the kernel allocator before the second operation completes. This results in dangling pointers within the GPU command streamer or display controller hardware interfaces, which then attempt to read from or write to invalid physical addresses. The severity of this issue is compounded by its location in the graphics driver stack, which often operates with high privileges and direct access to system memory, making it a potent vector for escalating local user privileges to kernel level.
The operational impact of this vulnerability extends beyond simple application crashes or graphical artifacts. Memory corruption in the GPU driver can lead to arbitrary code execution if an attacker can carefully craft input sequences that exploit the race condition to overwrite critical kernel data structures such as function pointers, return addresses, or security cookies. This enables a local unprivileged user to bypass standard operating system security controls and gain full control over the host device. Furthermore, because graphics drivers are frequently involved in handling inputs from multiple sources including web browsers, media players, and gaming engines, this vulnerability could potentially be triggered remotely if an attacker can force the victim application to render maliciously crafted content that triggers the specific buffer allocation patterns required to exploit the race condition. The ATT&CK framework categorizes such exploitation techniques under T1059 Command and Scripting Interpreter or more specifically within privilege escalation vectors where kernel-level memory corruption is leveraged for code execution, highlighting the critical nature of this flaw in mobile and embedded device security postures.
Mitigation strategies must focus on strengthening the synchronization primitives governing buffer object lifecycle management. Developers should implement strict locking mechanisms around all operations that create, reference, or destroy buffer objects to ensure atomicity during concurrent access. This includes utilizing robust kernel APIs for reference counting and ensuring that cleanup routines are properly serialized with respect to hardware submission queues. Additionally, enabling static analysis tools and fuzzing frameworks specifically targeting the DRM subsystem can help identify similar race conditions before deployment. For end-users and system administrators, applying vendor-provided security patches is essential as these updates typically contain the necessary code fixes to enforce proper synchronization. Long-term architectural improvements should involve adopting memory-safe abstractions or formal verification methods for critical driver components to prevent recurrence of such concurrency-related defects in future revisions of the Exynos GPU stack.