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FKIE_CVE-2026-72159

Vulnerability from fkie_nvd - Published: 2026-08-15 06:21 - Updated: 2026-08-17 06:18
Severity
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2174c68f623b74bd8690a4a6a4a52882d8ac3dc3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38c1ef7ce50eb4af0f89038b8aba12396ddb9233
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3bfeb436d4be6a2beb56cab344770e93e6b07260
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/416d3e5f8a30ed04fe21ba7dc73c2841c3b56265
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83f6756a7b71adec0a41ae68e079a38906d59c6c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d837068eefbc2651fe5789bf75a0f945710f7b8e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed0f938f946f16b772e99cb8c277ab57828e5be4
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "416d3e5f8a30ed04fe21ba7dc73c2841c3b56265",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "ed0f938f946f16b772e99cb8c277ab57828e5be4",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "83f6756a7b71adec0a41ae68e079a38906d59c6c",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "38c1ef7ce50eb4af0f89038b8aba12396ddb9233",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "d837068eefbc2651fe5789bf75a0f945710f7b8e",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "2174c68f623b74bd8690a4a6a4a52882d8ac3dc3",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "3bfeb436d4be6a2beb56cab344770e93e6b07260",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            },
            {
              "lessThan": "7ebc672fab7a76e1e47e0f2fc1ee48118d27fde4",
              "status": "affected",
              "version": "b657c95c11088d77fc1bfc9c84d940f778bf9d12",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ocfs2/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: reject non-inline dinodes with i_size and zero i_clusters\n\nOn a volume mounted without OCFS2_FEATURE_INCOMPAT_SPARSE_ALLOC, a\nnon-inline regular file with non-zero i_size and zero i_clusters is\nstructurally malformed: the extent map declares no allocated clusters yet\nthe size header claims content exists.  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()."
    }
  ],
  "id": "CVE-2026-72159",
  "lastModified": "2026-08-17T06:18:16.133",
  "metrics": {},
  "published": "2026-08-15T06:21:33.720",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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