CVE-2026-45942

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the ext4 file system between page migration and bitmap modification during mixed huge-page workloads. The issue occurs because the fast path of the load buddy function only increments the folio reference count, which fails to prevent concurrent folio migration. This can lead to e4b bitmap inconsistency reports. Additionally, a race condition exists where the bitmap and group descriptor become momentarily inconsistent, causing false positive corruption reports when the DOUBLE CHECK macro is enabled. This happens because processes may use a folio in an uptodate state without holding the folio lock, bypassing the protection intended by mb cmp bitmaps().

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