CVE-2025-21861

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.13.0-09623-g6c216bc522fd

Description: A vulnerability in the Linux kernel has been resolved. The issue is related to the migrate device finalize() function, where a folio to be freed is not added to the LRU, causing memcg code to produce warnings. The vulnerability is triggered when the folio putback lru() function is called on folios with memcg data equal to 0. The issue is likely to cause unnecessary steps in the LRU handling, but it does not seem to cause any further problems.

Recommendations: At the moment, there is no information about a newer version that contains a fix for this vulnerability.