GHSA-X5PR-3426-W9PH

Vulnerability from github – Published: 2025-08-22 18:31 – Updated: 2026-01-07 18:30
VLAI
Details

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

f2fs: fix to avoid out-of-boundary access in devs.path

  • touch /mnt/f2fs/012345678901234567890123456789012345678901234567890123
  • truncate -s $((102410241024)) \ /mnt/f2fs/012345678901234567890123456789012345678901234567890123
  • touch /mnt/f2fs/file
  • truncate -s $((102410241024)) /mnt/f2fs/file
  • mkfs.f2fs /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \ -c /mnt/f2fs/file
  • mount /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \ /mnt/f2fs/loop

[16937.192225] F2FS-fs (loop0): Mount Device [ 0]: /mnt/f2fs/012345678901234567890123456789012345678901234567890123\xff\x01, 511, 0 - 3ffff [16937.192268] F2FS-fs (loop0): Failed to find devices

If device path length equals to MAX_PATH_LEN, sbi->devs.path[] may not end up w/ null character due to path array is fully filled, So accidently, fields locate after path[] may be treated as part of device path, result in parsing wrong device path.

struct f2fs_dev_info { ... char path[MAX_PATH_LEN]; ... };

Let's add one byte space for sbi->devs.path[] to store null character of device path string.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Show details on source website
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38652"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-08-22T16:15:40Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid out-of-boundary access in devs.path\n\n- touch /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- truncate -s $((1024*1024*1024)) \\\n  /mnt/f2fs/012345678901234567890123456789012345678901234567890123\n- touch /mnt/f2fs/file\n- truncate -s $((1024*1024*1024)) /mnt/f2fs/file\n- mkfs.f2fs /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  -c /mnt/f2fs/file\n- mount /mnt/f2fs/012345678901234567890123456789012345678901234567890123 \\\n  /mnt/f2fs/loop\n\n[16937.192225] F2FS-fs (loop0): Mount Device [ 0]: /mnt/f2fs/012345678901234567890123456789012345678901234567890123\\xff\\x01,      511,        0 -    3ffff\n[16937.192268] F2FS-fs (loop0): Failed to find devices\n\nIf device path length equals to MAX_PATH_LEN, sbi-\u003edevs.path[] may\nnot end up w/ null character due to path array is fully filled, So\naccidently, fields locate after path[] may be treated as part of\ndevice path, result in parsing wrong device path.\n\nstruct f2fs_dev_info {\n...\n\tchar path[MAX_PATH_LEN];\n...\n};\n\nLet\u0027s add one byte space for sbi-\u003edevs.path[] to store null\ncharacter of device path string.",
  "id": "GHSA-x5pr-3426-w9ph",
  "modified": "2026-01-07T18:30:21Z",
  "published": "2025-08-22T18:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38652"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b1efa5f0e878745e94a98022e8edc675a87d78e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1cf1ff15f262e8baf12201b270b6a79f9d119b2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/345fc8d1838f3f8be7c8ed08d86a13dedef67136"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3466721f06edff834f99d9f49f23eabc6b2cb78e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5661998536af52848cc4d52a377e90368196edea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/666b7cf6ac9aa074b8319a2b68cba7f2c30023f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70849d33130a2cf1d6010069ed200669c8651fbd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/755427093e4294ac111c3f9e40d53f681a0fbdaa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc0172c74bd9edaee7bea2ebb35f3dbd37a8ae80"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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