{"id":"CVE-2024-42304","summary":"ext4: make sure the first directory block is not a hole","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: make sure the first directory block is not a hole\n\nThe syzbot constructs a directory that has no dirblock but is non-inline,\ni.e. the first directory block is a hole. And no errors are reported when\ncreating files in this directory in the following flow.\n\n    ext4_mknod\n     ...\n      ext4_add_entry\n        // Read block 0\n        ext4_read_dirblock(dir, block, DIRENT)\n          bh = ext4_bread(NULL, inode, block, 0)\n          if (!bh && (type == INDEX || type == DIRENT_HTREE))\n          // The first directory block is a hole\n          // But type == DIRENT, so no error is reported.\n\nAfter that, we get a directory block without '.' and '..' but with a valid\ndentry. This may cause some code that relies on dot or dotdot (such as\nmake_indexed_dir()) to crash.\n\nTherefore when ext4_read_dirblock() finds that the first directory block\nis a hole report that the filesystem is corrupted and return an error to\navoid loading corrupted data from disk causing something bad.","modified":"2026-10-08T02:48:34.424673574Z","published":"2024-08-17T09:09:10.545Z","related":["SUSE-SU-2024:3551-1","SUSE-SU-2024:3561-1","SUSE-SU-2024:3564-1","SUSE-SU-2024:3569-1","SUSE-SU-2024:3587-1","SUSE-SU-2024:3592-1","SUSE-SU-2025:20073-1","SUSE-SU-2025:20077-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42304.json"},"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html"},{"type":"WEB","url":"https://git.kernel.org/stable/c/299bc6ffa57e04e74c6cce866d6c0741fb4897a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9771e3d8365ae1dd5e8846a204cb9af14e3e656a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b609753cbbd38f8c0affd4956c0af178348523ac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c3893d9de8ee153baac56d127d844103488133b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d81d7e347d1f1f48a5634607d39eb90c161c8afe"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de2a011a13a46468a6e8259db58b1b62071fe136"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e02f9941e8c011aa3eafa799def6a134ce06bcfa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/42xxx/CVE-2024-42304.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-42304"},{"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":"3a17ca864baffc0c6f6e8aad525aa4365775a193"},{"fixed":"d81d7e347d1f1f48a5634607d39eb90c161c8afe"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4e19d6b65fb4fc42e352ce9883649e049da14743"},{"fixed":"e02f9941e8c011aa3eafa799def6a134ce06bcfa"},{"fixed":"de2a011a13a46468a6e8259db58b1b62071fe136"},{"fixed":"9771e3d8365ae1dd5e8846a204cb9af14e3e656a"},{"fixed":"b609753cbbd38f8c0affd4956c0af178348523ac"},{"fixed":"c3893d9de8ee153baac56d127d844103488133b5"},{"fixed":"299bc6ffa57e04e74c6cce866d6c0741fb4897a1"},{"fixed":"f9ca51596bbfd0f9c386dd1c613c394c78d9e5e6"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.62"},{"fixed":"4.19.320"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.187"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.135"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.1.21"},{"fixed":"5.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.2.4"},{"fixed":"5.3"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"3f0307b0d2d8b333a6964fc4c820dc86896fd1cf"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"514631c2225c1fd556c799cc1893fb27b0f48f00"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7f1f86276515f6816a98f6ca3ef99c827d54642f"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5021b7a5bdd6bb859eb648c3da71cdd6aae1d133"}]}],"versions":["v4.19.319","v4.19.318","v4.19.317","v4.19.316","v4.19.315","v4.19.314","v4.19.313","v4.19.312","v4.19.311","v4.19.310","v4.19.309","v4.19.308","v4.19.307","v4.19.306","v4.19.305","v4.19.304","v4.19.303","v4.19.302","v4.19.301","v4.19.300","v4.19.299","v4.19.298","v4.19.297","v4.19.296","v4.19.295","v4.19.294","v4.19.293","v4.19.292","v4.19.291","v4.19.290","v4.19.289","v4.19.288","v4.19.287","v4.19.286","v4.19.285","v4.19.284","v4.19.283","v4.19.282","v4.19.281","v4.19.280","v4.19.279","v4.19.278","v4.19.277","v4.19.276","v4.19.275","v4.19.274","v4.19.273","v4.19.272","v4.19.271","v4.19.270","v4.19.269","v4.19.268","v4.19.267","v4.19.266","v4.19.265","v4.19.264","v4.19.263","v4.19.262","v4.19.261","v4.19.260","v4.19.259","v4.19.258","v4.19.257","v4.19.256","v4.19.255","v4.19.254","v4.19.253","v4.19.252","v4.19.251","v4.19.250","v4.19.249","v4.19.248","v4.19.247","v4.19.246","v4.19.245","v4.19.244","v4.19.243","v4.19.242","v4.19.241","v4.19.240","v4.19.239","v4.19.238","v4.19.237","v4.19.236","v4.19.235","v4.19.234","v4.19.233","v4.19.232","v4.19.231","v4.19.230","v4.19.229","v4.19.228","v4.19.227",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