ocfs2: avoid moving extents to occupied clusters

{
  "id": "f2e2b7c95eaf8392ae4adf180e47240162308ad746c1242348a41a99ae6c1a90",
  "url": "https://osv.dev/vulnerability/CVE-2026-72164",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ocfs2: avoid moving extents to occupied clusters",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ocfs2: avoid moving extents to occupied clusters For non-auto OCFS2_IOC_MOVE_EXT operations, userspace supplies a physical me_goal. ocfs2_move_extent() initializes new_phys_cpos from that goal and expects ocfs2_probe_alloc_group() to replace it with a free run in the target block group. The probe currently leaves *phys_cpos unchanged if the scan reaches the end of the group without finding a free run. An occupied goal at the last bit can therefore survive the probe and be passed to __ocfs2_move_extent(), which copies file data into a cluster still owned by another inode before the bitmap is updated. When the probe does find a free run, it also subtracts move_len from the ending bit. The start of an N-bit run ending at i is i - N + 1, so the current calculation can report the bit immediately before the free run. Clear *phys_cpos before scanning and use the correct free-run start. Callers already treat a zero result as -ENOSPC, so failed probes no longer continue with an occupied caller-controlled goal.",
    "evidence": "osv:CVE-2026-72164",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-72164",
      "aliases": [
        "CVE-2026-72164"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                {
                  "fixed": "35486b291b8fbde6c4d0b1c79e565c6260d3329d"
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                {
                  "fixed": "19f7b04924b20b81dabbeed19d5542792ba5b6d6"
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                {
                  "fixed": "e281d892ce5870a50fdc718cb3bfc3dd5b62c728"
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                {
                  "fixed": "0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e"
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          "database_specific": {
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "3.0.0"
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                  "fixed": "5.10.261"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:34.015490915Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d0c5c17b18bdbc592ac26ab4d1de7e3dbf9be1e",
        "https://git.kernel.org/stable/c/19f7b04924b20b81dabbeed19d5542792ba5b6d6",
        "https://git.kernel.org/stable/c/22920541c35a9f23f219038ba5874c843a7c4419",
        "https://git.kernel.org/stable/c/3112afebf2a76e522fbaabcbb0c47aafbdc35932",
        "https://git.kernel.org/stable/c/35486b291b8fbde6c4d0b1c79e565c6260d3329d",
        "https://git.kernel.org/stable/c/4d1953d3aeb4a7f6623083e1839068ee1c157db2",
        "https://git.kernel.org/stable/c/d5d5a21fb33cd9b963aea99da81e4dacd452cd95",
        "https://git.kernel.org/stable/c/e281d892ce5870a50fdc718cb3bfc3dd5b62c728",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72164.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72164",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72164.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72164",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 501192,
  "published_at": "2026-08-15T05:53:31.901+00:00"
}