CVE-2026-23793 in Exynos
Summary
by MITRE • 09/14/2026
An issue was discovered in Samsung Mobile Processor Exynos 1330, 1380, 1480, and 2400. An out-of-bounds memory access vulnerability in the camera GDC driver may lead to kernel memory corruption under certain conditions.
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Analysis
by VulDB Data Team • 09/14/2026
The identified vulnerability resides within the Graphics Data Converter (GDC) driver subsystem of Samsung’s Exynos mobile processor series, specifically affecting models 1330, 1380, 1480, and 2400. This component is responsible for handling image data transformations such as scaling, rotation, and color space conversion, which are critical operations in modern smartphone camera pipelines. The core technical flaw is an out-of-bounds memory access condition that occurs when the driver fails to properly validate input parameters or buffer boundaries before processing image data. In a typical execution flow, user-space applications request specific image processing tasks by passing descriptors containing source and destination buffer addresses along with dimensions and format specifications. If these inputs are crafted maliciously or result from unexpected state transitions within the camera stack, the GDC driver may attempt to read from or write to memory locations outside the allocated kernel buffers. This lack of rigorous boundary checking allows for unauthorized access to adjacent memory regions that belong to other kernel structures or processes.
The operational impact of this vulnerability is severe due to its location in kernel space and its potential for exploitation by local attackers. An out-of-bounds read can lead to information disclosure, allowing an attacker with sufficient privileges within the Android sandboxed environment to leak sensitive data such as cryptographic keys, session tokens, or private user content stored in adjacent memory pages. More critically, an out-of-bounds write enables kernel memory corruption, which is a primary vector for privilege escalation attacks. By carefully crafting malformed image buffers and triggering the GDC processing pipeline repeatedly, an attacker can overwrite critical kernel function pointers, control flow integrity structures, or security flags. This manipulation allows the execution of arbitrary code with root-level privileges, effectively compromising the entire device's security posture. Such exploitation bypasses standard Android sandboxing mechanisms because it operates at a lower level than application isolation boundaries.
From a classification perspective, this vulnerability aligns closely with CWE-125 Out-of-bounds Read and CWE-787 Out-of-bounds Write in the Common Weakness Enumeration framework. These weaknesses stem from insufficient validation of array indices or buffer sizes during runtime operations. In terms of attack tactics, this flaw facilitates techniques categorized under MITRE ATT&CK Mobile as Privilege Escalation via Local Exploitation. The attacker typically leverages a trusted application with camera permissions to trigger the vulnerable driver function, thereby bridging the gap between untrusted user space and privileged kernel space without requiring physical access or remote network interaction. This makes it particularly dangerous in scenarios where malicious apps are installed through sideloading or compromised app stores that request excessive hardware privileges.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Samsung should release a security update that patches the GDC driver to enforce strict bounds checking before any memory access operations occur. This includes validating buffer lengths against allocated sizes, ensuring stride values do not exceed width constraints, and verifying format compatibility with hardware capabilities. Developers implementing camera drivers must adopt secure coding practices such as using static analysis tools to detect potential overflows during development phases. Additionally, enabling Kernel Hardening features like KASLR (Kernel Address Space Layout Randomization) and SMEP/SMAP (Supervisor Mode Execution Prevention / Supervisor Mode Access Prevention) can mitigate the exploitability of memory corruption vulnerabilities by making it significantly harder for attackers to predict target addresses or execute code in kernel mode. Users should ensure their devices are updated with the latest security patches provided by Samsung, as these updates contain the necessary fixes for this specific driver flaw.