{"id":"CVE-2026-74645","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-74645","generatedAt":"2026-10-28T07:25:18.402Z","title":"In the Linux kernel, the following vulnerability has been resolved: mm/damon/lru_sort: error out for >10000 active_mem_bp damos_quota_score() can trigger division by zero if the target value is zero.","description":"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.","published":"2026-08-22T16:16:38.000Z","lastModified":"2026-10-14T13:10:00.000Z","status":"Received","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":null,"cwe":[],"affected":[],"epss":{"score":0.00198,"percentile":0.09432,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/06befa61c427e74319781e6f35a364cfc32dbae8","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e7e5e5e0dfe2ea171044c24c263efae4ee882b3f","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74645","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}