CVE-2025-68350
Unknown Unknown - Not Provided

Divide-by-Zero Vulnerability in Linux exFAT Causes System Crash

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: exfat: fix divide-by-zero in exfat_allocate_bitmap The variable max_ra_count can be 0 in exfat_allocate_bitmap(), which causes a divide-by-zero error in the subsequent modulo operation (i % max_ra_count), leading to a system crash. When max_ra_count is 0, it means that readahead is not used. This patch load the bitmap without readahead.

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2025-68350
EUVD
EUVD-2025-205104

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is a divide-by-zero error in the Linux kernel's exfat file system code. Specifically, the variable max_ra_count can be zero in the function exfat_allocate_bitmap(), which leads to a divide-by-zero operation (i % max_ra_count). This causes the system to crash. The issue occurs because when max_ra_count is zero, it indicates that readahead is not used, and the code did not handle this case properly.

Impact Analysis

This vulnerability can cause a system crash due to a divide-by-zero error in the exfat file system code. A crash can lead to denial of service, potentially causing data loss or system unavailability until the system is restarted or fixed.

Mitigation Strategies

Apply the patch that fixes the divide-by-zero error in exfat_allocate_bitmap by updating the Linux kernel to a version that includes the fix for this vulnerability.

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