CVE-2025-36937

Technical Details

CVE-2025-36937 resides within the AudioDecoder::HandleProduceRequest function in audio_decoder.cc of the Android operating system. The vulnerability stems from an insufficient bounds check performed before writing data to a memory buffer. Specifically, the code fails to adequately validate the size of the input data against the allocated buffer size. This oversight allows an attacker to craft a malicious audio stream that, when processed by the AudioDecoder, causes data to be written beyond the boundaries of the allocated buffer. This out-of-bounds write can overwrite adjacent memory regions, potentially corrupting critical system data or injecting malicious code. The lack of proper input validation makes the system susceptible to exploitation through specially crafted audio files or streams. Successful exploitation could lead to arbitrary code execution within the context of the affected process, granting the attacker control over the device.

The vulnerability is triggered during the processing of an audio stream. When the HandleProduceRequest function receives a request to produce audio data, it attempts to decode and write the data into a buffer. The insufficient bounds check allows an attacker to manipulate the size parameters of the request, causing the function to write beyond the allocated buffer. This can be achieved by providing a crafted audio stream with specific header values or metadata that influence the size calculations within the decoding process. The attacker needs to carefully craft the input to ensure that the out-of-bounds write overwrites specific memory locations to achieve the desired outcome, such as injecting malicious code or altering critical system data.