CVE-2024-45025 is a medium severity vulnerability in the Linux kernel involving bitmap corruption in the close_range() function when used with the CLOSE_RANGE_UNSHARE flag. The issue arises from improper copying of file descriptor bitmaps, which can lead to incorrect descriptor states after closing a range of descriptors. This can cause unexpected behavior such as dup(0) returning an incorrect descriptor number. The vulnerability has been fixed by improving the bitmap copying logic to prevent garbage bits from causing corruption.