Division by Zero Vulnerability in Linux Kernel's DAMON Module

CVE-2026-99240

What is CVE-2026-99240?

A vulnerability exists in the Linux kernel's DAMON module where a zero target value for the DAMOS quota can lead to a division by zero error. This issue arises when some API callers neglect to validate the target_value parameter correctly. To resolve this, a patch has been implemented to manage this checking within the core logic, thus preventing errors from occurring multiple times across different API callers. This enhancement improves the overall reliability and safety of the DAMON API by ensuring proper validation in the core layer.

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