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CVE-2026-72160

ocfs2: reject dinodes with non-canonical i_mode type

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In 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().

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in 2e3aac33988ef4e4170141db8e995693ea38357c; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in fb024ea29f6cb1f01745e5f2e31646f3acb9aa6f; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in 157d31ef45038d89cd19620105e082d43c8e41e0; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in a5b555bcabbb0aff8745ad181768eaf9d964c1ee; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in 82afe13558354390d8a592a5334d5f4fd72c0e5c; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in 4db3b6a2a8ecf2a89d26a4090ace4072c6fad050; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in b858f2d57cfc9d57ce61b86051d603dc0ebccd40; From b657c95c11088d77fc1bfc9c84d940f778bf9d12 · fixed in 5366a017099c6a3c443be908a05f26fd72af12a1

  • Linux Linux

    2.6.29

  • KernelLinux

    From 2.6.29 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org