exfat: fix the infinite loop in exfat_readdir()

{
  "id": "50e96c32ba2ea3b77fa12818b71bec44fe0e895626b33d5acf4514fa5b4b99c3",
  "url": "https://osv.dev/vulnerability/CVE-2024-57940",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "exfat: fix the infinite loop in exfat_readdir()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: exfat: fix the infinite loop in exfat_readdir() If the file system is corrupted so that a cluster is linked to itself in the cluster chain, and there is an unused directory entry in the cluster, 'dentry' will not be incremented, causing condition 'dentry < max_dentries' unable to prevent an infinite loop. This infinite loop causes s_lock not to be released, and other tasks will hang, such as exfat_sync_fs(). This commit stops traversing the cluster chain when there is unused directory entry in the cluster to avoid this infinite loop.",
    "evidence": "osv:CVE-2024-57940",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.234",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.177",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.125",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.72",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-57940",
      "aliases": [
        "CVE-2024-57940"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "d8cfbb8723bd3d3222f360227a1cc15227189ca6"
                },
                {
                  "fixed": "28c21f0ac5293a4bf19b3e0e32005d6dd31a6c17"
                },
                {
                  "fixed": "31beabd0f47f8c3ed9965ba861c9e5b252d4920a"
                },
                {
                  "fixed": "dc1d7afceb982e8f666e70a582e6b5aa806de063"
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                {
                  "fixed": "d9ea94f5cd117d56e573696d0045ab3044185a15"
                },
                {
                  "fixed": "fee873761bd978d077d8c55334b4966ac4cb7b59"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-57940.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.7.0"
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                {
                  "fixed": "5.10.234"
                }
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.177"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
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                {
                  "fixed": "6.1.125"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
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                {
                  "fixed": "6.6.72"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-57940.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:48.767744850Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
        "https://cert-portal.siemens.com/productcert/html/ssa-503939.html",
        "https://git.kernel.org/stable/c/28c21f0ac5293a4bf19b3e0e32005d6dd31a6c17",
        "https://git.kernel.org/stable/c/31beabd0f47f8c3ed9965ba861c9e5b252d4920a",
        "https://git.kernel.org/stable/c/d8cfbb8723bd3d3222f360227a1cc15227189ca6",
        "https://git.kernel.org/stable/c/d9ea94f5cd117d56e573696d0045ab3044185a15",
        "https://git.kernel.org/stable/c/dc1d7afceb982e8f666e70a582e6b5aa806de063",
        "https://git.kernel.org/stable/c/fee873761bd978d077d8c55334b4966ac4cb7b59",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/57xxx/CVE-2024-57940.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-57940",
        "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/2024/57xxx/CVE-2024-57940.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-57940",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 516825,
  "published_at": "2025-01-21T12:18:09.15+00:00"
}