CVE-2026-80718 mm/percpu-km: fix bitmap overflow and accounting in pcpu_create_chunk()

In the Linux kernel, the following vulnerability has been resolved: mm/percpu-km: fix bitmap overflow and accounting in pcpucreatechunk In pcpucreatechunk, nrpages is the total contiguous backing allocation, i.e., nrunits pcpuunitpages, but pcpuchunkpopulated uses it to set chunk-populated, whose...