{"id":"CVE-2025-39909","state":"PUBLISHED","title":"mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()\n\nPatch series \"mm/damon: avoid divide-by-zero in DAMON module's parameters\napplication\".\n\nDAMON's RECLAIM and LRU_SORT modules perform no validation on\nuser-configured parameters during application, which may lead to\ndivision-by-zero errors.\n\nAvoid the divide-by-zero by adding validation checks when DAMON modules\nattempt to apply the parameters.\n\n\nThis patch (of 2):\n\nDuring the calculation of 'hot_thres' and 'cold_thres', either\n'sample_interval' or 'aggr_interval' is used as the divisor, which may\nlead to division-by-zero errors.  Fix it by directly returning -EINVAL\nwhen such a case occurs.  Additionally, since 'aggr_interval' is already\nrequired to be set no smaller than 'sample_interval' in damon_set_attrs(),\nonly the case where 'sample_interval' is zero needs to be checked.","publishedAt":"2025-10-01T07:44:32.936Z","updatedAt":"2026-05-11T21:38:45.192Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"74e391f7da7d9d5235a3cca88ee9fc18f720c75b","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"7bb675c9f0257840d33e5d1337d7e3afdd74a6bf","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"af0ae62b935317bed1a1361c8c9579db9d300e70","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"326a4b3750c71af3f3c52399ec4dbe33b6da4c26","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"711f19dfd783ffb37ca4324388b9c4cb87e71363","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/lru_sort.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.153","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.107","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.48","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.8","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/lru_sort.c"]}],"references":["https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b","https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf","https://git.kernel.org/stable/c/af0ae62b935317bed1a1361c8c9579db9d300e70","https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26","https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363","https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/39xxx/CVE-2025-39909.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-39909","state":"PUBLISHED","datePublished":"2025-10-01T07:44:32.936Z","dateUpdated":"2026-05-11T21:38:45.192Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.146Z"},"containers":{"cna":{"title":"mm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/lru_sort: avoid divide-by-zero in damon_lru_sort_apply_parameters()\n\nPatch series \"mm/damon: avoid divide-by-zero in DAMON module's parameters\napplication\".\n\nDAMON's RECLAIM and LRU_SORT modules perform no validation on\nuser-configured parameters during application, which may lead to\ndivision-by-zero errors.\n\nAvoid the divide-by-zero by adding validation checks when DAMON modules\nattempt to apply the parameters.\n\n\nThis patch (of 2):\n\nDuring the calculation of 'hot_thres' and 'cold_thres', either\n'sample_interval' or 'aggr_interval' is used as the divisor, which may\nlead to division-by-zero errors.  Fix it by directly returning -EINVAL\nwhen such a case occurs.  Additionally, since 'aggr_interval' is already\nrequired to be set no smaller than 'sample_interval' in damon_set_attrs(),\nonly the case where 'sample_interval' is zero needs to be checked."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"74e391f7da7d9d5235a3cca88ee9fc18f720c75b","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"7bb675c9f0257840d33e5d1337d7e3afdd74a6bf","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"af0ae62b935317bed1a1361c8c9579db9d300e70","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"326a4b3750c71af3f3c52399ec4dbe33b6da4c26","versionType":"git"},{"version":"40e983cca9274e177bd5b9379299b44d9536ac68","status":"affected","lessThan":"711f19dfd783ffb37ca4324388b9c4cb87e71363","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/lru_sort.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.153","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.107","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.48","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.16.8","status":"unaffected","lessThanOrEqual":"6.16.*","versionType":"semver"},{"version":"6.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["mm/damon/lru_sort.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/74e391f7da7d9d5235a3cca88ee9fc18f720c75b"},{"url":"https://git.kernel.org/stable/c/7bb675c9f0257840d33e5d1337d7e3afdd74a6bf"},{"url":"https://git.kernel.org/stable/c/af0ae62b935317bed1a1361c8c9579db9d300e70"},{"url":"https://git.kernel.org/stable/c/326a4b3750c71af3f3c52399ec4dbe33b6da4c26"},{"url":"https://git.kernel.org/stable/c/711f19dfd783ffb37ca4324388b9c4cb87e71363"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:38:45.192Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.107"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.48"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.16.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.17"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2025-11-03T17:44:35.076Z"}}]}}}