GHSA-5H77-9826-97QG

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32
VLAI
Details

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

fs/adfs: validate nzones in adfs_validate_bblk()

Reject ADFS disc records with a zero zone count during boot block validation, before the disc record is used.

When nzones is 0, adfs_read_map() passes it to kmalloc_array(0, ...) which returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to dm[-1], causing an out-of-bounds write before the allocated buffer.

adfs_validate_dr0() already rejects nzones != 1 for old-format images. Add the equivalent check to adfs_validate_bblk() for new-format images so that a crafted image with nzones == 0 is rejected at probe time.

Found by syzkaller.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52992"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:10Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/adfs: validate nzones in adfs_validate_bblk()\n\nReject ADFS disc records with a zero zone count during boot block\nvalidation, before the disc record is used.\n\nWhen nzones is 0, adfs_read_map() passes it to kmalloc_array(0, ...)\nwhich returns ZERO_SIZE_PTR, and adfs_map_layout() then writes to\ndm[-1], causing an out-of-bounds write before the allocated buffer.\n\nadfs_validate_dr0() already rejects nzones != 1 for old-format\nimages.  Add the equivalent check to adfs_validate_bblk() for\nnew-format images so that a crafted image with nzones == 0 is\nrejected at probe time.\n\nFound by syzkaller.",
  "id": "GHSA-5h77-9826-97qg",
  "modified": "2026-06-24T18:32:43Z",
  "published": "2026-06-24T18:32:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52992"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1586bd2d2fb436a26df20a70e78b000d34a7d159"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f0ed0f57f0fc87e46fe19a05435c214dc464be2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/33aafd2418a59c96c0389d47ea09026661fa9ec6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/60d82592ac8b5637fbed871381eb0a16df0a492e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a11372a8b1ceaa5e950a84b3b5fbf8228f25e277"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3fd5dc1c7b0aae947a67dc2e2c037d57557a4de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd9d3e16c2d5fa166e13dce07413be51f42c8f5d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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