CVE-2026-52992 (GCVE-0-2026-52992)
Vulnerability from cvelistv5
Published
2026-06-24 16:29
Modified
2026-06-24 16:29
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
Version: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/adfs/super.c"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:05.592Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/33aafd2418a59c96c0389d47ea09026661fa9ec6"
        },
        {
          "url": "https://git.kernel.org/stable/c/1f0ed0f57f0fc87e46fe19a05435c214dc464be2"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebc"
        },
        {
          "url": "https://git.kernel.org/stable/c/a11372a8b1ceaa5e950a84b3b5fbf8228f25e277"
        },
        {
          "url": "https://git.kernel.org/stable/c/1586bd2d2fb436a26df20a70e78b000d34a7d159"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3fd5dc1c7b0aae947a67dc2e2c037d57557a4de"
        },
        {
          "url": "https://git.kernel.org/stable/c/60d82592ac8b5637fbed871381eb0a16df0a492e"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd9d3e16c2d5fa166e13dce07413be51f42c8f5d"
        }
      ],
      "title": "fs/adfs: validate nzones in adfs_validate_bblk()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52992",
    "datePublished": "2026-06-24T16:29:05.592Z",
    "dateReserved": "2026-06-09T07:44:35.377Z",
    "dateUpdated": "2026-06-24T16:29:05.592Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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