{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39909",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-39909"
  ],
  "published": "2025-10-01T07:47:34Z",
  "summary": "mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()",
  "details": "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's parameters\napplication\".\n\nDAMON's 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 'hot_thres' and 'cold_thres', either\n'sample_interval' or 'aggr_interval' 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 'aggr_interval' is already\nrequired to be set no smaller than 'sample_interval' in damon_set_attrs(),\nonly the case where 'sample_interval' is zero needs to be checked.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.153",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39909"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af0ae62b935317bed1a1361c8c9579db9d300e70"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
  }
}