CVE-2025-39909 - mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()

CVE-2025-39909 - mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()

https://cvefeed.io/rssfeed/latest.atom / Wed, 10/01/2025 - 11:41
CVE ID : CVE-2025-39909
Published : Oct. 1, 2025, 8:15 a.m. | 1 hour, 17 minutes ago
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.
Severity: 0.0 | NA
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