CVE-2025-40006

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.17.0-rc5-00044-g7aac71907bde

Description The Linux kernel contains a flaw in the hugetlb subsystem related to folio management. Specifically, a race condition can occur during folio deletion when migration is in progress, potentially leading to a folio being incorrectly reported as not mapped. This can result in a bug within the filemap subsystem, specifically in filemap unaccount folio. The issue arises because the folio lock is not held when checking if a folio is mapped, allowing a race with migration. This can lead to the folio being mapped again after migration has attempted to unmap it.

Recommendations Update to a version of the Linux kernel that is later than 6.17.0-rc5-00044-g7aac71907bde.