Linux Kernel Vulnerability in DAMON Migration Functionality

CVE-2025-39700

What is CVE-2025-39700?

A vulnerability exists in the Linux kernel related to the DAMON migration functionality, where invalid node migration requests can be made. This can result in kernel errors and crashes, particularly when users inadvertently attempt to migrate pages to non-existent nodes using the DAMOS_MIGRATE_{HOT,COLD} actions. The kernel fails to handle these invalid requests properly, potentially leading to a page fault condition. Mitigation for this issue involves adding a validity check for target nodes in the damon_migrate_pages() function, helping to prevent such errors.

References