CVE-2026-28583 in Android
Summary
by MITRE • 09/08/2026
In validate_camera_metadata_structure of camera_metadata.c, there is a possible out of bounds write due to a logical error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified within the Android Camera HAL implementation specifically targets the validate_camera_metadata_structure function located in camera_metadata.c. This component serves as a critical validation layer responsible for ensuring that metadata structures passed between different parts of the camera subsystem adhere to strict format and size constraints before being processed or stored. The core technical flaw stems from a logical error during the bounds checking phase, where the code fails to correctly calculate or verify the upper limit of an array or buffer index based on user-supplied or system-generated input values. Instead of rejecting malformed metadata that exceeds expected boundaries, the validation logic allows these invalid indices to pass through unchecked. This oversight creates a classic out-of-bounds write condition, allowing an attacker who can influence the content of camera metadata structures to write data beyond the allocated memory space associated with the target buffer.
From a technical perspective, this logical error represents a failure in input validation and boundary enforcement, which are fundamental principles of secure coding practices. When the system processes camera parameters such as sensor settings, image processing configurations, or hardware control commands, it relies on these metadata structures to maintain state consistency across the HAL (Hardware Abstraction Layer). By exploiting the out-of-bounds write, an attacker can overwrite adjacent memory locations that may contain critical program data, function pointers, or return addresses. This capability effectively bypasses standard memory safety protections if they are not fully enabled or configured in a way that prevents exploitation of this specific flaw. The absence of proper index validation means that maliciously crafted metadata packets can manipulate the internal state of the camera service process without triggering immediate segmentation faults or access violations, thereby facilitating silent corruption of system memory.
The operational impact of this vulnerability is severe due to its potential for local privilege escalation. Since the camera HAL typically runs with elevated privileges relative to standard user applications, successfully exploiting this out-of-bounds write allows an attacker to execute arbitrary code within a privileged context. The description notes that no additional execution privileges are required and no user interaction is needed, which significantly lowers the barrier to exploitation. An application or service running in a lower privilege domain can trigger this vulnerability by sending specially crafted camera metadata requests through standard IPC mechanisms provided by Android's binder interface. Once executed, the attacker gains control over the privileged process, enabling them to bypass security sandboxes, access sensitive data stored on the device, install persistent malware, or further pivot into other system components. This aligns with common attack patterns where untrusted input leads to memory corruption and subsequent privilege escalation.
In terms of industry standards classification, this vulnerability maps directly to CWE-787: Out-of-bounds Write, which describes writing data outside the bounds of a buffer due to insufficient validation of array indices or pointer arithmetic. Furthermore, given that it allows for local privilege escalation without user interaction, it falls under MITRE ATT&CK technique T1068: Exploitation for Privilege Escalation. The lack of required user interaction also highlights risks associated with automated exploitation vectors where background processes can trigger the flaw independently. To mitigate this risk, developers must implement rigorous bounds checking within the validate_camera_metadata_structure function to ensure that all indices and sizes are strictly validated against allocated buffer limits before any write operations occur. Additionally, employing memory safety features such as Address Space Layout Randomization (ASLR), Stack Canaries, and Full RELRO can help reduce the likelihood of successful exploitation by making it harder for attackers to predict target addresses or overwrite critical control data. Regular static analysis and fuzzing of camera HAL components are also recommended to detect similar logical errors in metadata handling logic before deployment.