CVE-2026-68990 in Exynos 1480
Summary
by MITRE • 11/05/2026
In the Samsung Exynos H-Arx DRM plugin, improper input validation during buffer operations can cause memory corruption, potentially leading to denial of service or privilege escalation.
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Analysis
by VulDB Data Team • 11/05/2026
The vulnerability identified in the Samsung Exynos Hardware Acceleration Rendering (H-ARX) Direct Rendering Manager (DRM) plugin stems from a critical failure in input validation mechanisms when handling buffer operations within the Linux kernel graphics subsystem. The H-ARX component is responsible for offloading rendering tasks to dedicated hardware accelerators, which requires precise synchronization between user-space applications and kernel-space drivers. When an application submits buffers for processing, the driver must rigorously verify that these buffers meet specific size constraints, alignment requirements, and memory accessibility standards before passing them to the hardware engine. In this instance, the validation logic fails to adequately check boundary conditions or validate pointer integrity prior to dereferencing or mapping these buffers into kernel address space. This oversight allows a malicious actor who can execute code within an unprivileged user context to supply crafted buffer descriptors that exceed expected limits or point to invalid memory regions.
The technical flaw manifests as improper input validation, specifically categorized under CWE-20: Improper Input Validation. By exploiting this weakness, an attacker can trigger out-of-bounds writes or reads during the buffer processing phase. Because the DRM subsystem operates with high privileges within the kernel space, any corruption of internal data structures such as page tables, scatter-gather lists, or synchronization primitives can have severe consequences. The immediate operational impact is often a system crash or hang, resulting in a denial of service for all users on the device. However, the more critical risk lies in the potential for privilege escalation. If an attacker can control the content written to corrupted memory locations, they may overwrite function pointers, return addresses, or security-critical flags within kernel structures. This capability enables arbitrary code execution with root-level privileges, effectively compromising the entire integrity of the operating system and allowing full control over device resources.
From a threat modeling perspective, this vulnerability aligns with ATT&CK technique T1068: Exploitation for Privilege Escalation, as it involves leveraging software vulnerabilities to gain higher access levels than originally permitted. It also relates to CWE-787: Out-of-bounds Write and CWE-416: Use After Free if the buffer management logic fails to properly track allocation states before reuse. The exploitation path typically requires local access to the device, meaning an attacker must first compromise a user account or run malicious software on the target system. Once inside, they interact with the DRM interface through standard graphics APIs such as OpenGL ES or Vulkan, which ultimately call into the kernel driver where the validation gap exists.
Mitigation strategies for this vulnerability focus primarily on patching the affected Exynos drivers to enforce strict boundary checks and validate all user-supplied buffer parameters before hardware submission. Developers should implement robust sanity checks that verify buffer sizes against allocated memory regions and ensure that pointers are valid and accessible within the current process context. Additionally, enabling kernel hardening features such as Kernel Page Table Isolation (KPTI) can mitigate some exploitation attempts by isolating kernel memory from user space, although this does not fix the underlying logic error. For end-users, applying the latest security patches provided by device manufacturers is essential to close these gaps. System administrators should also monitor for unusual spikes in GPU-related system calls or unexpected crashes that might indicate attempted exploitation of this flaw. Regular code audits focusing on memory management and input validation in graphics drivers are crucial to preventing similar issues in future releases.