Memory Management Issue in Linux Kernel Affecting Migration Procedures

CVE-2025-21861

What is CVE-2025-21861?

In the Linux kernel, a flaw exists in the memory migration process where a folio may be incorrectly added to the Least Recently Used (LRU) list during migration, potentially affecting the memcontrol group (memcg) functionality. This occurs when either the migration succeeds or fails, resulting in incorrect memory data references. The consequence of this error is that the system may experience unnecessary operational warnings and decreased efficiency in memory management. The correct flow is now implemented to avoid this issue during device migration.

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