{"id":"CVE-2021-47579","details":"In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix warning in ovl_create_real()\n\nSyzbot triggered the following warning in ovl_workdir_create() -\u003e\novl_create_real():\n\n\tif (!err && WARN_ON(!newdentry-\u003ed_inode)) {\n\nThe reason is that the cgroup2 filesystem returns from mkdir without\ninstantiating the new dentry.\n\nWeird filesystems such as this will be rejected by overlayfs at a later\nstage during setup, but to prevent such a warning, call ovl_mkdir_real()\ndirectly from ovl_workdir_create() and reject this case early.","modified":"2026-03-15T22:43:15.891373Z","published":"2024-06-19T15:15:52.427Z","related":["ALSA-2024:5101"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0"},{"type":"FIX","url":"https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c"},{"type":"FIX","url":"https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"4.19.222"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.168"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.88"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.11"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47579.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}