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

{
  "id": "3bdf59be6174ae6c82e76a6680bd090535072b063d2640baa120ce731b918e88",
  "url": "https://osv.dev/vulnerability/CVE-2025-21874",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dm-integrity: Avoid divide by zero in table status in Inline mode",
    "summary": "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] ...",
    "evidence": "osv:CVE-2025-21874",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.18",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.13.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-21874",
      "aliases": [
        "CVE-2025-21874"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fb0987682c629c1d2c476f35f6fde405a5e304a4"
                },
                {
                  "fixed": "22c6f577b3cb184857b440ae5e5916f6c9e7021d"
                },
                {
                  "fixed": "06d9895f265282e939a8933bb18de82eba2b4dda"
                },
                {
                  "fixed": "7fb39882b20c98a9a393c244c86b56ef6933cff8"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21874.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.12.18"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.13.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21874.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.954254277Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/06d9895f265282e939a8933bb18de82eba2b4dda",
        "https://git.kernel.org/stable/c/22c6f577b3cb184857b440ae5e5916f6c9e7021d",
        "https://git.kernel.org/stable/c/7fb39882b20c98a9a393c244c86b56ef6933cff8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21874.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21874",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21874.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21874",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 487983,
  "published_at": "2025-03-27T14:57:05.496+00:00"
}