ghsa-vhqh-g62v-gqxx
Vulnerability from github
Published
2025-03-27 15:31
Modified
2025-03-27 15:31
Details

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

dm-integrity: Avoid divide by zero in table status in Inline mode

In Inline mode, the journal is unused, and journal_sectors is zero.

Calculating the journal watermark requires dividing by journal_sectors, which should be done only if the journal is configured.

Otherwise, a simple table query (dmsetup table) can cause OOPS.

This bug did not show on some systems, perhaps only due to compiler optimization.

On my 32-bit testing machine, this reliably crashes with the following:

: Oops: divide error: 0000 [#1] PREEMPT SMP : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959 : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity] ...

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21874"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-27T15:15:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: Avoid divide by zero in table status in Inline mode\n\nIn Inline mode, the journal is unused, and journal_sectors is zero.\n\nCalculating the journal watermark requires dividing by journal_sectors,\nwhich should be done only if the journal is configured.\n\nOtherwise, a simple table query (dmsetup table) can cause OOPS.\n\nThis bug did not show on some systems, perhaps only due to\ncompiler optimization.\n\nOn my 32-bit testing machine, this reliably crashes with the following:\n\n : Oops: divide error: 0000 [#1] PREEMPT SMP\n : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959\n : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity]\n ...",
  "id": "GHSA-vhqh-g62v-gqxx",
  "modified": "2025-03-27T15:31:11Z",
  "published": "2025-03-27T15:31:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21874"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06d9895f265282e939a8933bb18de82eba2b4dda"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22c6f577b3cb184857b440ae5e5916f6c9e7021d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fb39882b20c98a9a393c244c86b56ef6933cff8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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