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CVE-2026-72159 (GCVE-0-2026-72159)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:09
VLAI
Title
ocfs2: reject non-inline dinodes with i_size and zero i_clusters
Summary
In the Linux kernel, the following vulnerability has been resolved: ocfs2: reject non-inline dinodes with i_size and zero i_clusters On a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a non-inline regular file with non-zero i_size and zero i_clusters is structurally malformed: the extent map declares no allocated clusters yet the size header claims content exists. Keep rejecting that shape, but express it through a shared predicate so the same invariant is available to normal inode reads and online filecheck. The same zero-cluster shape is also malformed for non-inline directories. ocfs2 directory growth allocates backing storage before advancing i_size, and ocfs2_dir_foreach_blk_el() later walks until ctx->pos reaches i_size_read(inode). A forged directory dinode with a huge i_size and no clusters would repeatedly fail on holes while advancing through the claimed size. Sparse regular files remain exempt: on sparse-alloc volumes, truncate can legitimately grow i_size without allocating clusters. System inodes and inline-data dinodes also retain their separate storage rules. Mirror the check in ocfs2_filecheck_validate_inode_block() as well. filecheck reports through its own error namespace, so malformed size/cluster state is logged as a filecheck invalid-inode result rather than via ocfs2_error(), but it must not proceed into ocfs2_populate_inode().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 416d3e5f8a30ed04fe21ba7dc73c2841c3b56265 (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < ed0f938f946f16b772e99cb8c277ab57828e5be4 (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 83f6756a7b71adec0a41ae68e079a38906d59c6c (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 38c1ef7ce50eb4af0f89038b8aba12396ddb9233 (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < d837068eefbc2651fe5789bf75a0f945710f7b8e (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 2174c68f623b74bd8690a4a6a4a52882d8ac3dc3 (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 3bfeb436d4be6a2beb56cab344770e93e6b07260 (git)
Affected: b657c95c11088d77fc1bfc9c84d940f778bf9d12 , < 7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "dateUpdated": "2026-08-17T05:09:19.690Z",
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Keep rejecting that shape, but\\nexpress it through a shared predicate so the same invariant is available\\nto normal inode reads and online filecheck.\\n\\nThe same zero-cluster shape is also malformed for non-inline directories. \\nocfs2 directory growth allocates backing storage before advancing i_size,\\nand ocfs2_dir_foreach_blk_el() later walks until ctx-\u003epos reaches\\ni_size_read(inode).  A forged directory dinode with a huge i_size and no\\nclusters would repeatedly fail on holes while advancing through the\\nclaimed size.\\n\\nSparse regular files remain exempt: on sparse-alloc volumes, truncate can\\nlegitimately grow i_size without allocating clusters.  System inodes and\\ninline-data dinodes also retain their separate storage rules.\\n\\nMirror the check in ocfs2_filecheck_validate_inode_block() as well. \\nfilecheck reports through its own error namespace, so malformed\\nsize/cluster state is logged as a filecheck invalid-inode result rather\\nthan via ocfs2_error(), but it must not proceed into\\nocfs2_populate_inode().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ocfs2/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"416d3e5f8a30ed04fe21ba7dc73c2841c3b56265\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"ed0f938f946f16b772e99cb8c277ab57828e5be4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"83f6756a7b71adec0a41ae68e079a38906d59c6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"38c1ef7ce50eb4af0f89038b8aba12396ddb9233\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"d837068eefbc2651fe5789bf75a0f945710f7b8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"2174c68f623b74bd8690a4a6a4a52882d8ac3dc3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"3bfeb436d4be6a2beb56cab344770e93e6b07260\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b657c95c11088d77fc1bfc9c84d940f778bf9d12\",\"lessThan\":\"7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ocfs2/inode.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.29\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.29\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T16:28:24+00:00",
      "cve": "CVE-2026-72159",
      "id": "CVE-2026-72159",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ocfs2: reject non-inline dinodes with i_size and zero i_clusters",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72159.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.