Sorry that the raw images you're working with suddenly showing up corrupted in Camera raw.
This corruption of images can occur because of two major factors:
1) Graphics card drivers are outdated on your computer and since Camera leverages the GPU, it is showing the image as corrupt.
To verify that the issue is related to GPU, please disable the GPU usage in Camera raw, Refer Adobe Camera Raw graphics processor (GPU) FAQ and troubleshooting
2) The source where your images are stored is corrupt, specifically it is a hardware failure. If your images are stored on an external drive or SD card. they might be causing this image corruption.