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

What is CVE-2025-39916?

CVE-2025-39916 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 1 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-369

Which versions are affected by CVE-2025-39916?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2025-39916?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2025-39916 being exploited?

There is no known exploitation of CVE-2025-39916 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-68022, BELL-CVE-2025-39916, DEBIAN-CVE-2025-39916, GHSA-54p7-c699-6p2v, ROOT-OS-UBUNTU-2404-CVE-2025-39916, UBUNTU-CVE-2025-39916.