CVE-2026-89965 nvdimm/btt: reject an arena whose nfree is below the lane count

In the Linux kernel, the following vulnerability has been resolved: nvdimm/btt: reject an arena whose nfree is below the lane count The BTT info block's nfree field, the number of reserve free blocks, is read from the medium without validation. bttfreelistinit and bttrttinit size the per-lane...