What’s Vulnerable › Vulnerabilities

CVE-2025-39916: mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-01 · updated 2026-10-19
• Weakness: CWE-369

Description

In the Linux kernel, the following vulnerability has been resolved: mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters() When creating a new scheme of DAMON_RECLAIM, the calculation of 'min_age_region' uses 'aggr_interval' as the divisor, which may lead to division-by-zero errors. Fix it by directly returning -EINVAL when such a case occurs.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 6.0.12 before 6.1.153; from 6.2 before 6.6.107; from 6.7 before 6.12.48; from 6.13 before 6.16.8; 6.17-rc1, 6.17-rc2, 6.17-rc3, 6.17-rc4, 6.17-rc5 — fixed in 6.1.153, 6.12.48, 6.16.8, 6.6.107

How to fix

Upgrade to a fixed version: Linux kernel 6.1.153, 6.12.48, 6.16.8, 6.6.107. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/40cb9b38b645126fdd1d6aa3d6811a8ad50ddfa1
• https://git.kernel.org/stable/c/5d6eeb3c683c777ed4538eb3a650bb7da17a7cff
• https://git.kernel.org/stable/c/64dc351e58271c1e9005e42f5216b4f3d7a39b66
• https://git.kernel.org/stable/c/9fe0415156fbde773b31f920201cb70b1f0e40fe
• https://git.kernel.org/stable/c/e6b543ca9806d7bced863f43020e016ee996c057
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html

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