{"id":"CVE-2026-72160","title":"ocfs2: reject dinodes with non-canonical i_mode type","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject dinodes with non-canonical i_mode type\n\nPatch series \"ocfs2: harden inode validators against forged metadata\", v2.\n\nThis series adds three structural chec…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 2e3aac33988ef4e4170141db8e995693ea38357c","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 157d31ef45038d89cd19620105e082d43c8e41e0","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < a5b555bcabbb0aff8745ad181768eaf9d964c1ee","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 82afe13558354390d8a592a5334d5f4fd72c0e5c","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 4db3b6a2a8ecf2a89d26a4090ace4072c6fad050","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < b858f2d57cfc9d57ce61b86051d603dc0ebccd40","Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 5366a017099c6a3c443be908a05f26fd72af12a1","Linux 2.6.29"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:43:05.217168Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:44:59.633Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72160","references":[{"url":"https://git.kernel.org/stable/c/2e3aac33988ef4e4170141db8e995693ea38357c"},{"url":"https://git.kernel.org/stable/c/fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f"},{"url":"https://git.kernel.org/stable/c/157d31ef45038d89cd19620105e082d43c8e41e0"},{"url":"https://git.kernel.org/stable/c/a5b555bcabbb0aff8745ad181768eaf9d964c1ee"},{"url":"https://git.kernel.org/stable/c/82afe13558354390d8a592a5334d5f4fd72c0e5c"},{"url":"https://git.kernel.org/stable/c/4db3b6a2a8ecf2a89d26a4090ace4072c6fad050"},{"url":"https://git.kernel.org/stable/c/b858f2d57cfc9d57ce61b86051d603dc0ebccd40"},{"url":"https://git.kernel.org/stable/c/5366a017099c6a3c443be908a05f26fd72af12a1"}],"tags":["cve.org"],"epss":0.0065,"epssPercentile":0.50125,"ingestedAt":"2026-10-16T19:46:24.427Z","slug":"CVE-2026-72160","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject dinodes with non-canonical i_mode type\n\nPatch series \"ocfs2: harden inode validators against forged metadata\", v2.\n\nThis series adds three structural checks to OCFS2 dinode validation so\nmalformed on-disk fields are rejected before ocfs2_populate_inode() copies\nthem into the in-core inode.\n\nThe checks cover:\n\n  - i_mode values whose type bits do not name a canonical POSIX file\n    type;\n  - non-device dinodes whose id1.dev1.i_rdev field is non-zero; and\n  - non-inline dinodes that claim non-zero i_size while i_clusters is\n    zero, covering directories unconditionally and regular files on\n    non-sparse volumes.\n\nThe normal read path reports these through ocfs2_error(), matching the\nexisting suballoc-slot, inline-data, chain-list, and refcount checks.  The\nonline filecheck path uses the same structural predicates but keeps its\nown reporting contract, returning OCFS2_FILECHECK_ERR_INVALIDINO instead\nof calling ocfs2_error().\n\n\nThis patch (of 3):\n\nocfs2_validate_inode_block() currently accepts any non-zero i_mode value. \nocfs2_populate_inode() then copies that mode verbatim into inode->i_mode\nand dispatches on i_mode & S_IFMT to the file/dir/symlink/special_file\niops; an unrecognised type falls through to ocfs2_special_file_iops and\ninit_special_inode().\n\nReject dinodes whose type bits do not name one of the seven canonical\nPOSIX file types.  Use fs_umode_to_ftype(), the same generic file-type\nconversion helper OCFS2 already uses for directory entries, so the\naccepted inode type set matches the kernel file-type vocabulary instead of\nopen-coding a local switch.\n\nApply the same structural check to the online filecheck read path. \nfilecheck keeps its own error namespace, so it reports malformed i_mode\nthrough the filecheck logger and OCFS2_FILECHECK_ERR_INVALIDINO instead of\ncalling ocfs2_error(), but it must not allow a malformed dinode to proceed\ninto ocfs2_populate_inode().\n\n## Affected\n\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 2e3aac33988ef4e4170141db8e995693ea38357c`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 157d31ef45038d89cd19620105e082d43c8e41e0`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < a5b555bcabbb0aff8745ad181768eaf9d964c1ee`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 82afe13558354390d8a592a5334d5f4fd72c0e5c`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 4db3b6a2a8ecf2a89d26a4090ace4072c6fad050`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < b858f2d57cfc9d57ce61b86051d603dc0ebccd40`\n- `Linux >= b657c95c11088d77fc1bfc9c84d940f778bf9d12 < 5366a017099c6a3c443be908a05f26fd72af12a1`\n- `Linux 2.6.29`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}