CVE-2026-52992 (GCVE-0-2026-52992)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
fs/adfs: validate nzones in adfs_validate_bblk()
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < 33aafd2418a59c96c0389d47ea09026661fa9ec6 (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < 1f0ed0f57f0fc87e46fe19a05435c214dc464be2 (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < 6ff8cca5cdb4f2e0ea6d28ecd78479dd3f221ebc (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < a11372a8b1ceaa5e950a84b3b5fbf8228f25e277 (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < 1586bd2d2fb436a26df20a70e78b000d34a7d159 (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < a3fd5dc1c7b0aae947a67dc2e2c037d57557a4de (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < 60d82592ac8b5637fbed871381eb0a16df0a492e (git)
Affected: f6f14a0d71b0773a1d4147d1a3c33d537cd213ab , < dd9d3e16c2d5fa166e13dce07413be51f42c8f5d (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.141 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-24T16:29:05.592Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/33aafd2418a59c96c0389d47ea09026661fa9ec6"
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    "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"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.