{"id":"CVE-2025-38247","summary":"userns and mnt_idmap leak in open_tree_attr(2)","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nuserns and mnt_idmap leak in open_tree_attr(2)\n\nOnce want_mount_setattr() has returned a positive, it does require\nfinish_mount_kattr() to release -\u003emnt_userns.  Failing do_mount_setattr()\ndoes not change that.\n\nAs the result, we can end up leaking userns and possibly mnt_idmap as\nwell.","modified":"2026-04-02T12:47:53.374664Z","published":"2025-07-09T10:42:28.531Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38247.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358"},{"type":"WEB","url":"https://git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38247.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38247"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c4a16820d90199409c9bf01c4f794e1e9e8d8fd8"},{"fixed":"142db4e76110dd80239f4e79810f85ea1735ad60"},{"fixed":"0748e553df0225754c316a92af3a77fdc057b358"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38247.json"}}],"schema_version":"1.7.5"}