CVE-2025-39909 (GCVE-0-2025-39909)
Vulnerability from cvelistv5
Published
2025-10-01 07:44
Modified
2025-10-01 07:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters() Patch series "mm/damon: avoid divide-by-zero in DAMON module's parameters application". DAMON's RECLAIM and LRU_SORT modules perform no validation on user-configured parameters during application, which may lead to division-by-zero errors. Avoid the divide-by-zero by adding validation checks when DAMON modules attempt to apply the parameters. This patch (of 2): During the calculation of 'hot_thres' and 'cold_thres', either 'sample_interval' or 'aggr_interval' is used as the divisor, which may lead to division-by-zero errors. Fix it by directly returning -EINVAL when such a case occurs. Additionally, since 'aggr_interval' is already required to be set no smaller than 'sample_interval' in damon_set_attrs(), only the case where 'sample_interval' is zero needs to be checked.
References
Impacted products
Vendor Product Version
Linux Linux Version: 40e983cca9274e177bd5b9379299b44d9536ac68
Version: 40e983cca9274e177bd5b9379299b44d9536ac68
Version: 40e983cca9274e177bd5b9379299b44d9536ac68
Version: 40e983cca9274e177bd5b9379299b44d9536ac68
Version: 40e983cca9274e177bd5b9379299b44d9536ac68
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{
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          "product": "Linux",
          "programFiles": [
            "mm/damon/lru_sort.c"
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()\n\nPatch series \"mm/damon: avoid divide-by-zero in DAMON module\u0027s parameters\napplication\".\n\nDAMON\u0027s RECLAIM and LRU_SORT modules perform no validation on\nuser-configured parameters during application, which may lead to\ndivision-by-zero errors.\n\nAvoid the divide-by-zero by adding validation checks when DAMON modules\nattempt to apply the parameters.\n\n\nThis patch (of 2):\n\nDuring the calculation of \u0027hot_thres\u0027 and \u0027cold_thres\u0027, either\n\u0027sample_interval\u0027 or \u0027aggr_interval\u0027 is used as the divisor, which may\nlead to division-by-zero errors.  Fix it by directly returning -EINVAL\nwhen such a case occurs.  Additionally, since \u0027aggr_interval\u0027 is already\nrequired to be set no smaller than \u0027sample_interval\u0027 in damon_set_attrs(),\nonly the case where \u0027sample_interval\u0027 is zero needs to be checked."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T07:44:32.936Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b"
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          "url": "https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26"
        },
        {
          "url": "https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363"
        }
      ],
      "title": "mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39909",
    "datePublished": "2025-10-01T07:44:32.936Z",
    "dateReserved": "2025-04-16T07:20:57.146Z",
    "dateUpdated": "2025-10-01T07:44:32.936Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
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  }
}


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