mm/damon: fix divide by zero in damon_get_intervals_score()

{
  "id": "c381e8b0c35569ec9e8154a6fdb51beeb2231bc179e5f72638352f07fc0ab7da",
  "url": "https://osv.dev/vulnerability/CVE-2025-38519",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/damon: fix divide by zero in damon_get_intervals_score()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/damon: fix divide by zero in damon_get_intervals_score() The current implementation allows having zero size regions with no special reasons, but damon_get_intervals_score() gets crashed by divide by zero when the region size is zero. [ 29.403950] Oops: divide error: 0000 [#1] SMP NOPTI This patch fixes the bug, but does not disallow zero size regions to keep the backward compatibility since disallowing zero size regions might be a breaking change for some users. In addition, the same crash can happen when intervals_goal.access_bp is zero so this should be fixed in stable trees as well.",
    "evidence": "osv:CVE-2025-38519",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.15.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38519",
      "aliases": [
        "CVE-2025-38519"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
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                  "fixed": "ca4bb9ac706f05ead8ac1cce7b8245fc0645a687"
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                {
                  "fixed": "bd225b9591442065beb876da72656f4a2d627d03"
                }
              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38519.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
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                {
                  "fixed": "6.15.7"
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              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38519.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.595780876Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/bd225b9591442065beb876da72656f4a2d627d03",
        "https://git.kernel.org/stable/c/ca4bb9ac706f05ead8ac1cce7b8245fc0645a687",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38519.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38519",
        "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/2025/38xxx/CVE-2025-38519.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2025-38519",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 504571,
  "published_at": "2025-08-16T10:55:06.083+00:00"
}