Linux Kernel Vulnerability in DAMON LRU_SORT Module

CVE-2025-39909

What is CVE-2025-39909?

A vulnerability in the DAMON module of the Linux Kernel can lead to division-by-zero errors due to insufficient validation of user-configured parameters. This issue arises during the application of parameters for the RECLAIM and LRU_SORT modules, where either 'sample_interval' or 'aggr_interval' may be used as a divisor without proper checks. The absence of these checks increases the risk of system instability, making it imperative for users to apply patched updates that incorporate validation for these parameters.

References