{"id":"CVE-2021-47579","state":"PUBLISHED","title":"ovl: fix warning in ovl_create_real()","description":"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() ->\novl_create_real():\n\n\tif (!err && WARN_ON(!newdentry->d_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.","publishedAt":"2024-06-19T14:53:46.750Z","updatedAt":"2026-05-11T13:57:17.709Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c","status":"affected","lessThan":"445d2dc63e5871d218f21b8f62ab29ac72f2e6b8","versionType":"git"},{"version":"e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c","status":"affected","lessThan":"f9f300a92297be8250547347fd52216ef0177ae0","versionType":"git"},{"version":"e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c","status":"affected","lessThan":"6859985a2fbda5d1586bf44538853e1be69e85f7","versionType":"git"},{"version":"e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c","status":"affected","lessThan":"d2ccdd4e4efab06178608a34d7bfb20a54104c02","versionType":"git"},{"version":"e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c","status":"affected","lessThan":"1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/overlayfs/dir.c","fs/overlayfs/overlayfs.h","fs/overlayfs/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"4.19.222","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.168","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.88","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.11","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/overlayfs/dir.c","fs/overlayfs/overlayfs.h","fs/overlayfs/super.c"]}],"references":["https://git.kernel.org/stable/c/445d2dc63e5871d218f21b8f62ab29ac72f2e6b8","https://git.kernel.org/stable/c/f9f300a92297be8250547347fd52216ef0177ae0","https://git.kernel.org/stable/c/6859985a2fbda5d1586bf44538853e1be69e85f7","https://git.kernel.org/stable/c/d2ccdd4e4efab06178608a34d7bfb20a54104c02","https://git.kernel.org/stable/c/1f5573cfe7a7056e80a92c7a037a3e69f3a13d1c"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47579.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47579","state":"PUBLISHED","datePublished":"2024-06-19T14:53:46.750Z","dateUpdated":"2026-05-11T13:57:17.709Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-24T15:11:00.730Z"},"containers":{"cna":{"title":"ovl: fix warning in ovl_create_real()","descriptions":[{"lang":"en","value":"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() ->\novl_create_real():\n\n\tif (!err && WARN_ON(!newdentry->d_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 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