{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74645", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.923Z", "datePublished": "2026-08-22T15:32:22.645Z", "dateUpdated": "2026-08-22T15:32:22.645Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:22.645Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/lru_sort: error out for >10000 active_mem_bp\n\ndamos_quota_score() can trigger division by zero if the target value is\nzero. DAMON_LRU_SORT lets users set the target value for the hot memory\nscheme via active_mem_bp parameter. It avoids setting it as the target\nvalue if the parameter value is zero. However, it also sets the cold\nmemory scheme with a target value that is calculated as '10000 -\nactive_mem_bp + 2'. Hence, if a user sets active_mem_bp 10002, the cold\nmemory scheme's quota goal target value can be zero. As a result,\ndivision by zero can be triggered. Fix by returning an error when the\nuser tries to start DAMON with >10000 active_mem_bp parameter value.\n\nIt makes no sense to set active_mem_bp with 10002. It also requires\nmodule parameters write permission to reproduce the issue. That said, the\nconsequence is quite bad.\n\nOne reliable way to reproduce the issue is like below:\n\n # cd /sys/module/damon_lru_sort/parameters\n # echo 1000 > wmarks_high\n # echo 995 > wmarks_mid\n # echo 0 > wmarks_low\n # echo 10002 > active_mem_bp\n # echo Y > enabled\n # dmesg -w\n [...]\n [ 597.421247] Oops: divide error: 0000 [#1] SMP NOPTI\n [ 597.428848] RIP: 0010:damos_quota_score+0x6f/0x480\n\nThis issue was discovered [1] by Sashiko."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/lru_sort.c"], "versions": [{"version": "40d98d31cd7060228e03303c5c34ae7101020416", "lessThan": "e7e5e5e0dfe2ea171044c24c263efae4ee882b3f", "status": "affected", "versionType": "git"}, {"version": "40d98d31cd7060228e03303c5c34ae7101020416", "lessThan": "06befa61c427e74319781e6f35a364cfc32dbae8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/damon/lru_sort.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e7e5e5e0dfe2ea171044c24c263efae4ee882b3f"}, {"url": "https://git.kernel.org/stable/c/06befa61c427e74319781e6f35a364cfc32dbae8"}], "title": "mm/damon/lru_sort: error out for >10000 active_mem_bp", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["mm/damon/lru_sort.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e7e5e5e0dfe2ea171044c24c263efae4ee882b3f", "status": "affected", "version": "40d98d31cd7060228e03303c5c34ae7101020416", "versionType": "git"}, {"lessThan": "06befa61c427e74319781e6f35a364cfc32dbae8", "status": "affected", "version": "40d98d31cd7060228e03303c5c34ae7101020416", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["mm/damon/lru_sort.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/lru_sort: error out for >10000 active_mem_bp\n\ndamos_quota_score() can trigger division by zero if the target value is\nzero. DAMON_LRU_SORT lets users set the target value for the hot memory\nscheme via active_mem_bp parameter. It avoids setting it as the target\nvalue if the parameter value is zero. However, it also sets the cold\nmemory scheme with a target value that is calculated as '10000 -\nactive_mem_bp + 2'. Hence, if a user sets active_mem_bp 10002, the cold\nmemory scheme's quota goal target value can be zero. As a result,\ndivision by zero can be triggered. Fix by returning an error when the\nuser tries to start DAMON with >10000 active_mem_bp parameter value.\n\nIt makes no sense to set active_mem_bp with 10002. It also requires\nmodule parameters write permission to reproduce the issue. That said, the\nconsequence is quite bad.\n\nOne reliable way to reproduce the issue is like below:\n\n # cd /sys/module/damon_lru_sort/parameters\n # echo 1000 > wmarks_high\n # echo 995 > wmarks_mid\n # echo 0 > wmarks_low\n # echo 10002 > active_mem_bp\n # echo Y > enabled\n # dmesg -w\n [...]\n [ 597.421247] Oops: divide error: 0000 [#1] SMP NOPTI\n [ 597.428848] RIP: 0010:damos_quota_score+0x6f/0x480\n\nThis issue was discovered [1] by Sashiko."}], "id": "CVE-2026-74645", "lastModified": "2026-08-22T16:16:37.837", "metrics": {}, "published": "2026-08-22T16:16:37.837", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06befa61c427e74319781e6f35a364cfc32dbae8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7e5e5e0dfe2ea171044c24c263efae4ee882b3f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40d98d31cd7060228e03303c5c34ae7101020416,e7e5e5e0dfe2ea171044c24c263efae4ee882b3f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[40d98d31cd7060228e03303c5c34ae7101020416,06befa61c427e74319781e6f35a364cfc32dbae8)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T17:15:04.453915+00:00", "updated": "2026-08-22T19:00:14.125524+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-369"]}