GHSA-JH5R-M3QC-3584
Vulnerability from github – Published: 2025-10-01 09:30 – Updated: 2026-01-16 21:30In 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.
{
"affected": [],
"aliases": [
"CVE-2025-39909"
],
"database_specific": {
"cwe_ids": [
"CWE-369"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T08:15:33Z",
"severity": "MODERATE"
},
"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\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.",
"id": "GHSA-jh5r-m3qc-3584",
"modified": "2026-01-16T21:30:27Z",
"published": "2025-10-01T09:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39909"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/af0ae62b935317bed1a1361c8c9579db9d300e70"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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