Linux Kernel exFAT Division-by-Zero Vulnerability in Bitmap Allocation

A division-by-zero vulnerability has been identified in the Linux kernel's exFAT file system implementation, specifically within the bitmap allocation function. The issue arises because the variable 'max_ra_count' can be zero, leading to a crash when the code attempts to perform a modulo operation with it. This situation occurs when readahead is not utilized. The vulnerability has been addressed by modifying the bitmap loading process to bypass readahead.

Impact

Exploitation of this vulnerability leads to a system crash.