{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72160", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.909Z", "datePublished": "2026-08-15T05:53:28.943Z", "dateUpdated": "2026-08-17T05:41:03.822Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:03.822Z" }, "descriptions": [ { "lang": "en", "value": "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()." } ], "metrics": [ { "cvssV3_1": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/inode.c" ], "versions": [ { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "2e3aac33988ef4e4170141db8e995693ea38357c", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "157d31ef45038d89cd19620105e082d43c8e41e0", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "a5b555bcabbb0aff8745ad181768eaf9d964c1ee", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "82afe13558354390d8a592a5334d5f4fd72c0e5c", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "4db3b6a2a8ecf2a89d26a4090ace4072c6fad050", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "b858f2d57cfc9d57ce61b86051d603dc0ebccd40", "status": "affected", "versionType": "git" }, { "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12", "lessThan": "5366a017099c6a3c443be908a05f26fd72af12a1", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/inode.c" ], "versions": [ { "version": "2.6.29", "status": "affected" }, { "version": "0", "lessThan": "2.6.29", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }