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CVE-2025-21861 is a resource-lifecycle flaw in the Linux kernel's device-memory migration finalization logic. After successful migration, folio_migrate_flags() and mem_cgroup_migrate() transfer memory-cgroup metadata to the destination folio and clear the source folio's memcg_data. After failed migration, the destination folio's memcg_data remains unset. migrate_device_finalize() can incorrectly call folio_putback_lru() on these folios pending release, adding them to the least-recently-used list without valid memory-cgroup metadata. This triggers memory-cgroup warnings, as reproduced by Heterogeneous Memory Management self-tests.
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A Linux kernel device-memory migration flaw incorrectly places folios awaiting release onto the least-recently-used list, triggering memory-cgroup warnings. The advisory rates it Medium, with a CVSS v3 score of 5.5 and an availability impact requiring local access and low privileges. The description notes that releasing the final folio reference likely removes it again without further problems.
Linux kernel device-memory migration folio LRU handling flaw.
A Linux kernel memory-management flaw in device-page migration finalization. Under successful or failed migration paths, a folio with unset memory-control-group data could be unnecessarily placed on the LRU list, causing memory-control-group warnings and potentially affecting availability.
Linux kernel device-memory migration folio handling flaw.
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Cross-references every affected SKU, including bundled OEM variants.
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