CVE-2026-72190

Summary

In the Linux kernel, the following vulnerability has been resolved:

ntfs: fix mrec_lock ABBA deadlock in rename

ntfs_file_fsync(), ntfs_dir_fsync() and __ntfs_write_inode() lock an inode's mrec_lock before taking the mrec_lock of its parent directory.

ntfs_rename() takes old_ni->mrec_lock and old_dir_ni->mrec_lock before taking new_ni->mrec_lock for an existing target, or new_dir_ni->mrec_lock for a cross-directory rename. This can deadlock when ntfs_file_fsync() or __ntfs_write_inode() holds the target inode, or when ntfs_dir_fsync() holds a child target directory, while rename() holds the parent directory and waits for the target.

Fix this by locking the existing target inode before taking any parent directory mrec_lock. For cross-directory renames where the target parent is a descendant of the source parent, lock the target parent before the source parent so the directory order matches the child-to-parent order used by ntfs_file_fsync(), ntfs_dir_fsync(), and __ntfs_write_inode().

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/b3d09502b80dfe0bab9090ca532710da389f6c7f
• https://git.kernel.org/stable/c/eb94f5a41a193a425e09a63cb75dffd151d8f42e

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