{"id":"CVE-2025-38247","state":"PUBLISHED","title":"userns and mnt_idmap leak in open_tree_attr(2)","description":"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 ->mnt_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.","publishedAt":"2025-07-09T10:42:28.531Z","updatedAt":"2026-05-11T21:24:06.263Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c4a16820d90199409c9bf01c4f794e1e9e8d8fd8","status":"affected","lessThan":"142db4e76110dd80239f4e79810f85ea1735ad60","versionType":"git"},{"version":"c4a16820d90199409c9bf01c4f794e1e9e8d8fd8","status":"affected","lessThan":"0748e553df0225754c316a92af3a77fdc057b358","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/namespace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.15.5","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/namespace.c"]}],"references":["https://git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60","https://git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/38xxx/CVE-2025-38247.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-38247","state":"PUBLISHED","datePublished":"2025-07-09T10:42:28.531Z","dateUpdated":"2026-05-11T21:24:06.263Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T04:51:23.997Z"},"containers":{"cna":{"title":"userns and mnt_idmap leak in open_tree_attr(2)","descriptions":[{"lang":"en","value":"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 ->mnt_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c4a16820d90199409c9bf01c4f794e1e9e8d8fd8","status":"affected","lessThan":"142db4e76110dd80239f4e79810f85ea1735ad60","versionType":"git"},{"version":"c4a16820d90199409c9bf01c4f794e1e9e8d8fd8","status":"affected","lessThan":"0748e553df0225754c316a92af3a77fdc057b358","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/namespace.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.15","versionType":"semver"},{"version":"6.15.5","status":"unaffected","lessThanOrEqual":"6.15.*","versionType":"semver"},{"version":"6.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/namespace.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/142db4e76110dd80239f4e79810f85ea1735ad60"},{"url":"https://git.kernel.org/stable/c/0748e553df0225754c316a92af3a77fdc057b358"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:24:06.263Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.15.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.15","versionEndExcluding":"6.16"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}