CVE-2026-72202 ntfs: avoid heap allocation for free-cluster readahead state

In the Linux kernel, the following vulnerability has been resolved: ntfs: avoid heap allocation for free-cluster readahead state getnrfreeclusters allocates a temporary filerastate before it publishes the precomputed free cluster count, sets NVolFreeClusterKnown, and wakes vol-freewaitq. If that...