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Vulnerability record · CVE-2025-39909 · published 1 October 2025

CVE-2025-39909: Linux kernel divide by zero vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.15% · top 96.8% CWE-369 · Divide by zero
5.5CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26 Patch
https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363 Patch
https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b Patch
https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf Patch
https://git.kernel.org/stable/c/af0ae62b935317bed1a1361c8c9579db9d300e70 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-39909), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.