Bug 2400612 (CVE-2025-39916)

Summary: CVE-2025-39916 kernel: mm/damon/reclaim: avoid divide-by-zero in damon_reclaim_apply_parameters()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 08:02:33 UTC 
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.
Comment 1 Alexander B 2025-10-02 11:17:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100111-CVE-2025-39916-63c0@gregkh/T