CVE-2026-72132 NFS: Charge unstable writes by request size, not folio size

In the Linux kernel, the following vulnerability has been resolved: NFS: Charge unstable writes by request size, not folio size nfsfoliomarkunstable and nfsfolioclearcommit charge and uncharge NRWRITEBACK/WBWRITEBACK by folionrpagesfolio once per request added to or removed from a commit list. Th...

CVE-2026-72132

The CVE-2026-72132 issue affects the Linux kernel’s NFS writeback accounting. When a folio is split into multiple requests, the code could erroneously charge or uncharge NR_WRITEBACK/WB_WRITEBACK by the entire folio size for each request, inflating accounting by up to N× and potentially pushing d...