CVE-2026-72132

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

Description An issue exists in the Network File System (NFS) implementation where unstable writes are charged based on folio size rather than request size. The functions nfs folio mark unstable() and nfs folio clear commit() charge and uncharge NR WRITEBACK/WB WRITEBACK using folio nr pages(folio) for every request added to or removed from a commit list. When a folio is split into multiple sub-folio requests—such as during pNFS flexfiles striping with a stripe unit smaller than the folio size or wsize-limited splitting—each request independently charges the full page count of the folio. This inflates accounting by a factor of N per folio, which can push global dirty and writeback accounting beyond the system threshold. Consequently, this forces all buffered writers on the host, including unrelated in-kernel NFS server threads, into the hard-throttle path.

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