dentry cache

Background A newly published Linux kernel CVE is drawing attention to a subtle but very real Btrfs failure mode: subvolumes can wind up with broken dentries, making them appear present to the VFS while behaving like dead entries underneath. In the reported scenario, ls shows a subvolume name in...

CVE-2026-31519 is a classic example of a small-looking filesystem bug producing a very awkward operational failure mode. In Btrfs, a subvolume can wind up with a broken dentry state where directory listings show a name that cannot be stat’d, deleted, or cleanly replaced, and the kernel may emit...