CVE-2026-23788 in Exynos
Summary
by MITRE • 09/14/2026
An issue was discovered in DPU in Samsung Mobile Processor Exynos 1280, 2200, and 1380. A heap overflow in the Exynos DRM HDR driver (due to improper buffer size validation) leads to kernel memory corruption and a system crash.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified within the Samsung Mobile Processor series, specifically affecting the Exynos 1280, 2200, and 1380 models, resides in the Data Processing Unit subsystem as manifested through the DRM HDR driver. This component is responsible for handling high dynamic range video processing tasks, which are critical for modern mobile display technologies. The core technical flaw stems from an improper buffer size validation mechanism within this driver. When the system processes multimedia data or receives commands related to HDR rendering, it allocates memory buffers based on input parameters provided by user-space applications or other kernel subsystems. In this specific instance, the driver fails to adequately verify that the requested buffer sizes are within acceptable limits relative to available physical and virtual memory resources. This lack of rigorous boundary checking allows an attacker who can trigger the affected code path to write data beyond the allocated heap boundaries.
This heap overflow condition leads directly to kernel memory corruption because the DRM HDR driver operates with high privileges in the Linux kernel space. When out-of-bounds writes occur, they overwrite adjacent memory structures that are critical for system stability and security. These overwritten regions may contain function pointers, object headers, or other control data used by the kernel scheduler, memory manager, or interrupt handlers. The immediate operational impact of this corruption is typically a system crash, often resulting in a kernel panic or an automatic reboot to prevent further instability. For mobile devices running these Exynos processors, such crashes manifest as sudden device restarts, frozen screens, or loss of display functionality during video playback or gaming sessions that utilize HDR features.
From a security perspective, while the primary observed impact is denial of service through system crash, heap overflows in kernel space are frequently precursors to more severe exploits. An attacker with local access could potentially manipulate the corrupted memory structures to achieve arbitrary code execution. By carefully crafting the overflow payload, it may be possible to overwrite function pointers or return addresses within the kernel, thereby gaining control over the processor flow and executing malicious shellcode with root privileges. This transforms a simple stability issue into a critical privilege escalation vulnerability. The attack vector is generally considered local, requiring an attacker to have access to the device's operating system environment, such as through a compromised application or direct physical access if lock screen protections are bypassed.
This vulnerability aligns closely with CWE-120, which describes buffer copy without checking size limits, and specifically relates to heap-based overflows where dynamic memory allocation is involved. In terms of the MITRE ATT&CK framework for mobile platforms, this behavior corresponds to techniques involving exploitation of resource management errors that lead to denial of service or potential privilege escalation via kernel exploits. The lack of proper input validation in a privileged driver component represents a fundamental design flaw that undermines the integrity of the operating system's memory protection mechanisms.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Samsung should release firmware updates that enforce strict bounds checking for all buffer allocations within the DRM HDR driver. This includes validating input parameters against maximum allowed sizes before any memory allocation occurs and implementing safeguards such as canaries or stack cookies to detect corruption attempts early. Device manufacturers must ensure these patches are delivered via over-the-air updates to end-users, particularly those relying on devices with affected Exynos chips for critical multimedia tasks. Additionally, developers integrating this hardware should audit their use of DRM APIs to ensure they do not inadvertently trigger edge cases in the driver's buffer handling logic until official fixes are applied.