CVE-2025-39909

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux40e983cca9274e177bd5b9379299b44d9536ac68 < 74e391f7da7d9d5235a3cca88ee9fc18f720c75baffected
LinuxLinux40e983cca9274e177bd5b9379299b44d9536ac68 < 7bb675c9f0257840d33e5d1337d7e3afdd74a6bfaffected
LinuxLinux40e983cca9274e177bd5b9379299b44d9536ac68 < af0ae62b935317bed1a1361c8c9579db9d300e70affected
LinuxLinux40e983cca9274e177bd5b9379299b44d9536ac68 < 326a4b3750c71af3f3c52399ec4dbe33b6da4c26affected
LinuxLinux40e983cca9274e177bd5b9379299b44d9536ac68 < 711f19dfd783ffb37ca4324388b9c4cb87e71363affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.153 <= 6.1.*unaffected
LinuxLinux6.6.107 <= 6.6.*unaffected
LinuxLinux6.12.48 <= 6.12.*unaffected
LinuxLinux6.16.8 <= 6.16.*unaffected
LinuxLinux6.17 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References