CVE-2026-72187ntfs: avoid self-deadlock during inode eviction

Official description

In the Linux kernel, the following vulnerability has been resolved: ntfs: avoid self-deadlock during inode eviction An attribute-list update performed while allocating clusters can drop the last reference to the temporary attribute inode. Evicting that inode drops its reference to the base inode and can invoke ntfs_drop_big_inode() for the base inode from within the base inode's own writeback path. If the base inode is unlinked, ntfs_drop_big_inode() calls truncate_setsize(), which waits for the inode's folio writeback to complete. The same writeback worker is responsible for completing that writeback, so it waits for itself indefinitely. Prevent this self-deadlock by grabbing a reference to the base inode at the beginning of ntfs_writepages() and releasing it at the end of the function. This defers eviction until all bios have been submitted, allowing the wait for folio writeback to complete safely.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/5a5f877c5df7605e9bae524a25ec0df9b9cb8ea8
• https://git.kernel.org/stable/c/77dc384207d5fa63ba97c3bf3285fe1215a1cbf6