{"id":"CVE-2026-72159","summary":"ocfs2: reject non-inline dinodes with i_size and zero i_clusters","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject non-inline dinodes with i_size and zero i_clusters\n\nOn a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a\nnon-inline regular file with non-zero i_size and zero i_clusters is\nstructurally malformed: the extent map declares no allocated clusters yet\nthe size header claims content exists.  Keep rejecting that shape, but\nexpress it through a shared predicate so the same invariant is available\nto normal inode reads and online filecheck.\n\nThe same zero-cluster shape is also malformed for non-inline directories. \nocfs2 directory growth allocates backing storage before advancing i_size,\nand ocfs2_dir_foreach_blk_el() later walks until ctx-\u003epos reaches\ni_size_read(inode).  A forged directory dinode with a huge i_size and no\nclusters would repeatedly fail on holes while advancing through the\nclaimed size.\n\nSparse regular files remain exempt: on sparse-alloc volumes, truncate can\nlegitimately grow i_size without allocating clusters.  System inodes and\ninline-data dinodes also retain their separate storage rules.\n\nMirror the check in ocfs2_filecheck_validate_inode_block() as well. \nfilecheck reports through its own error namespace, so malformed\nsize/cluster state is logged as a filecheck invalid-inode result rather\nthan via ocfs2_error(), but it must not proceed into\nocfs2_populate_inode().","modified":"2026-08-18T03:31:09.649515078Z","published":"2026-08-15T05:53:28.205Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72159.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260"},{"type":"WEB","url":"https://git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72159.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72159"},{"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":"b657c95c11088d77fc1bfc9c84d940f778bf9d12"},{"fixed":"416d3e5f8a30ed04fe21ba7dc73c2841c3b56265"},{"fixed":"ed0f938f946f16b772e99cb8c277ab57828e5be4"},{"fixed":"83f6756a7b71adec0a41ae68e079a38906d59c6c"},{"fixed":"38c1ef7ce50eb4af0f89038b8aba12396ddb9233"},{"fixed":"d837068eefbc2651fe5789bf75a0f945710f7b8e"},{"fixed":"2174c68f623b74bd8690a4a6a4a52882d8ac3dc3"},{"fixed":"3bfeb436d4be6a2beb56cab344770e93e6b07260"},{"fixed":"7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72159.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72159.json"}}],"schema_version":"1.9.0"}