ocfs2: reject dinodes with non-canonical i_mode type

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72160
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:33 UTC
Updated2026-08-17 06:18:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ocfs2: reject dinodes with non-canonical i_mode type Patch series "ocfs2: harden inode validators against forged metadata", v2. This series adds three structural checks to OCFS2 dinode validation so malformed on-disk fields are rejected before ocfs2_populate_inode() copies them into the in-core inode. The checks cover: - i_mode values whose type bits do not name a canonical POSIX file type; - non-device dinodes whose id1.dev1.i_rdev field is non-zero; and - non-inline dinodes that claim non-zero i_size while i_clusters is zero, covering directories unconditionally and regular files on non-sparse volumes. The normal read path reports these through ocfs2_error(), matching the existing suballoc-slot, inline-data, chain-list, and refcount checks. The online filecheck path uses the same structural predicates but keeps its own reporting contract, returning OCFS2_FILECHECK_ERR_INVALIDINO instead of calling ocfs2_error(). This patch (of 3): ocfs2_validate_inode_block() currently accepts any non-zero i_mode value. ocfs2_populate_inode() then copies that mode verbatim into inode->i_mode and dispatches on i_mode & S_IFMT to the file/dir/symlink/special_file iops; an unrecognised type falls through to ocfs2_special_file_iops and init_special_inode(). Reject dinodes whose type bits do not name one of the seven canonical POSIX file types. Use fs_umode_to_ftype(), the same generic file-type conversion helper OCFS2 already uses for directory entries, so the accepted inode type set matches the kernel file-type vocabulary instead of open-coding a local switch. Apply the same structural check to the online filecheck read path. filecheck keeps its own error namespace, so it reports malformed i_mode through the filecheck logger and OCFS2_FILECHECK_ERR_INVALIDINO instead of calling ocfs2_error(), but it must not allow a malformed dinode to proceed into ocfs2_populate_inode().

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.006320000 probability, percentile 0.473740000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 2e3aac33988ef4e4170141db8e995693ea38357c git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 157d31ef45038d89cd19620105e082d43c8e41e0 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 a5b555bcabbb0aff8745ad181768eaf9d964c1ee git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 82afe13558354390d8a592a5334d5f4fd72c0e5c git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 4db3b6a2a8ecf2a89d26a4090ace4072c6fad050 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 b858f2d57cfc9d57ce61b86051d603dc0ebccd40 git Not specified
CNA Linux Linux affected b657c95c11088d77fc1bfc9c84d940f778bf9d12 5366a017099c6a3c443be908a05f26fd72af12a1 git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4db3b6a2a8ecf2a89d26a4090ace4072c6fad050 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5366a017099c6a3c443be908a05f26fd72af12a1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5b555bcabbb0aff8745ad181768eaf9d964c1ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b858f2d57cfc9d57ce61b86051d603dc0ebccd40 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/157d31ef45038d89cd19620105e082d43c8e41e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e3aac33988ef4e4170141db8e995693ea38357c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82afe13558354390d8a592a5334d5f4fd72c0e5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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