Buffer Overflow Vulnerability in Linux Kernel's mpi3mr Driver

CVE-2023-53376

What is CVE-2023-53376?

The mpi3mr driver in the Linux kernel has a vulnerability where the sizes of bitmaps are incorrectly calculated in bytes rather than in bits. This discrepancy can lead to memory access beyond the allocated bitmap sizes, resulting in out-of-bounds memory access errors. Specifically, during firmware download to eHBA-9600, a 'BUG: KASAN: slab-out-of-bounds' issue was triggered in the find_first_zero_bit() function. The resolution involves using the correct number of bits for bitmap management and utilizing appropriate bitmap helper functions for memory allocation and deallocation. Adjustments to the data structure have also been made to accommodate these changes, enhancing overall memory safety.

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