cve-2026-31519

About this tag
CVE-2026-31519 is a Btrfs filesystem vulnerability affecting Linux systems, including those running Windows Subsystem for Linux (WSL) on Windows. The bug involves a subvolume orphan cleanup flag issue that can cause directory entries to become stuck in an inconsistent state, producing ENOENT and EEXIST errors. Administrators may encounter the kernel message "could not do orphan cleanup -2" during lookups, and the problem can lead to transaction aborts until the dentry cache is cleared or the filesystem is recovered. The published fix sets the BTRFS_ROOT_ORPHAN_CLEANUP flag during subvolume creation to prevent this failure mode. Users should apply kernel updates to address CVE-2026-31519 and avoid operational disruptions.

  1. Btrfs CVE-2026-31519: Subvolume Orphan Cleanup Flag Bug Causes ENOENT/EEXIST

    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...
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