{"api_version":"1","generated_at":"2026-08-22T05:31:12+00:00","cve":"CVE-2026-72160","urls":{"html":"https://cve.report/CVE-2026-72160","api":"https://cve.report/api/cve/CVE-2026-72160.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72160","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72160"},"summary":{"title":"ocfs2: reject dinodes with non-canonical i_mode type","description":"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 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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:33","updated_at":"2026-08-17 06:18:16"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/4db3b6a2a8ecf2a89d26a4090ace4072c6fad050","name":"https://git.kernel.org/stable/c/4db3b6a2a8ecf2a89d26a4090ace4072c6fad050","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5366a017099c6a3c443be908a05f26fd72af12a1","name":"https://git.kernel.org/stable/c/5366a017099c6a3c443be908a05f26fd72af12a1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a5b555bcabbb0aff8745ad181768eaf9d964c1ee","name":"https://git.kernel.org/stable/c/a5b555bcabbb0aff8745ad181768eaf9d964c1ee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b858f2d57cfc9d57ce61b86051d603dc0ebccd40","name":"https://git.kernel.org/stable/c/b858f2d57cfc9d57ce61b86051d603dc0ebccd40","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/157d31ef45038d89cd19620105e082d43c8e41e0","name":"https://git.kernel.org/stable/c/157d31ef45038d89cd19620105e082d43c8e41e0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f","name":"https://git.kernel.org/stable/c/fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2e3aac33988ef4e4170141db8e995693ea38357c","name":"https://git.kernel.org/stable/c/2e3aac33988ef4e4170141db8e995693ea38357c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/82afe13558354390d8a592a5334d5f4fd72c0e5c","name":"https://git.kernel.org/stable/c/82afe13558354390d8a592a5334d5f4fd72c0e5c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72160","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72160","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 2e3aac33988ef4e4170141db8e995693ea38357c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 157d31ef45038d89cd19620105e082d43c8e41e0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 a5b555bcabbb0aff8745ad181768eaf9d964c1ee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72160","cve":"CVE-2026-72160","epss":"0.006320000","percentile":"0.473740000","score_date":"2026-08-17","updated_at":"2026-08-18 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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()."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - OCFS2 registers export_operations, so when kernel nfsd serves an OCFS2-backed NFS export on shared cluster storage, remote NFS LOOKUP/GETFH requests drive ocfs2_iget()->ocfs2_read_inode_block()->ocfs2_validate_inode_block() over the network without local syscalls on the server.\nAC:L - An attacker can deterministically set a non-canonical i_mode (e.g., permission bits without S_IFMT) in a crafted OCFS2 dinode and trigger ocfs2_populate_inode() through a normal pathname lookup or NFS file handle resolution; no races or uncontrollable heap layout are required.\nPR:L - Triggering the read path requires only authenticated NFS client access to an exported path containing the forged dinode, or mounting a crafted OCFS2 loop image where CAP_SYS_ADMIN is obtainable by an unprivileged user via user namespaces, matching comparable OCFS2 metadata CVEs.\nUI:N - No victim interaction is needed once forged dinode metadata exists on the volume: a remote NFS client or the attacker mounting a crafted local image can perform the triggering lookup themselves without any third party opening files or mounting the filesystem.\nS:U - Type confusion corrupts in-core inode dispatch state (i_mode/i_rdev/i_op/i_fop mismatch) on the host processing forged OCFS2 metadata; this does not cross VM, container, or IOMMU boundaries into another security authority.\nC:H - Non-canonical i_mode passes validation and populates the inode with attacker-controlled i_rdev before falling through to init_special_inode(), creating type-confused in-core metadata that can expose kernel memory through subsequent VFS getattr and page-cache operations.\nI:H - Accepting forged i_mode installs ocfs2_special_file_iops and attacker-controlled i_rdev on an inode whose type bits are not a valid POSIX special file, leaving inconsistent i_op/i_fop/a_ops state constituting exploitable type confusion writable through further VFS operations.\nA:H - The confused inode state can provoke kernel oops or panics when subsequent VFS operations (e.g., open with missing i_fop, or page-cache I/O via mismatched ocfs2_aops) are attempted on the malformed inode, denying availability until reboot."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:03.822Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}],"title":"ocfs2: reject dinodes with non-canonical i_mode type","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72160","datePublished":"2026-08-15T05:53:28.943Z","dateReserved":"2026-08-09T03:40:39.909Z","dateUpdated":"2026-08-17T05:41:03.822Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:33","lastModifiedDate":"2026-08-17 06:18:16","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72160","Ordinal":"1","Title":"ocfs2: reject dinodes with non-canonical i_mode type","CVE":"CVE-2026-72160","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72160","Ordinal":"1","NoteData":"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 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().","Type":"Description","Title":"ocfs2: reject dinodes with non-canonical i_mode type"}]}}}