ghsa-hf8q-334g-vr2p
Vulnerability from github
Published
2024-12-27 15:31
Modified
2025-11-03 21:31
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

erofs: handle NONHEAD !delta[1] lclusters gracefully

syzbot reported a WARNING in iomap_iter_done: iomap_fiemap+0x73b/0x9b0 fs/iomap/fiemap.c:80 ioctl_fiemap fs/ioctl.c:220 [inline]

Generally, NONHEAD lclusters won't have delta[1]==0, except for crafted images and filesystems created by pre-1.0 mkfs versions.

Previously, it would immediately bail out if delta[1]==0, which led to inadequate decompressed lengths (thus FIEMAP is impacted). Treat it as delta[1]=1 to work around these legacy mkfs versions.

lclusterbits > 14 is illegal for compact indexes, error out too.

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{
  "affected": [],
  "aliases": [
    "CVE-2024-53234"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-12-27T14:15:31Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: handle NONHEAD !delta[1] lclusters gracefully\n\nsyzbot reported a WARNING in iomap_iter_done:\n iomap_fiemap+0x73b/0x9b0 fs/iomap/fiemap.c:80\n ioctl_fiemap fs/ioctl.c:220 [inline]\n\nGenerally, NONHEAD lclusters won\u0027t have delta[1]==0, except for crafted\nimages and filesystems created by pre-1.0 mkfs versions.\n\nPreviously, it would immediately bail out if delta[1]==0, which led to\ninadequate decompressed lengths (thus FIEMAP is impacted).  Treat it as\ndelta[1]=1 to work around these legacy mkfs versions.\n\n`lclusterbits \u003e 14` is illegal for compact indexes, error out too.",
  "id": "GHSA-hf8q-334g-vr2p",
  "modified": "2025-11-03T21:31:50Z",
  "published": "2024-12-27T15:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-53234"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0bc8061ffc733a0a246b8689b2d32a3e9204f43c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/480c6c7b55aeacac800bc2a0d321ff53273045e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75a0a6dde803e7a3af700da8da9a361b49f69eba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/daaf68fef4b2ff97928227630021d37b27a96655"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f466641debcbea8bdf78d1b63a6270aadf9301bf"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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