{"affected":[{"defaultStatus":"unaffected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"lessThan":"58321b4e6e4f0f412069ab27ccdd56292757343a","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"},{"lessThan":"74fef68d521150281e36cdaa20e9e1ee3e3aa146","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"},{"lessThan":"ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"},{"lessThan":"9c8f31eaae6140ecadec0c07320498a944556de2","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"},{"lessThan":"76e415ea88d20f022ed5cfcf78c50e156a267e91","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"},{"lessThan":"35d4a3cf70a855b50e53189ac2f8463e20a02046","status":"affected","version":"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","source":"CNA: Linux","vendor":"Linux","versions":[{"status":"affected","version":"5.16"},{"lessThan":"5.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeConfigurations":[{"negate":false,"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"6.2","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:*","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"cveId":"CVE-2026-64458","cwes":["CWE-369"],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/ops-common: handle extreme intervals in damon_hot_score()\n\nFix three issues in damon_hot_score() that comes from wrong handling of\nextreme (zero or too high) monitoring intervals user setup.\n\nWhen the user sets sampling interval zero, damon_max_nr_accesses(), which\nis called from damon_hot_score(), causes a divide-by-zero.  Needless to\nsay, it is a problem.\n\nWhen the user sets the aggregation interval zero, the function returns\nzero.  It is wrong, since the real maximum nr_acceses in the setup should\nbe one.  Worse yet, it can cause another divide-by-zero from its caller,\ndamon_hot_score(), since it uses damon_max_nr_accesses() return value as a\ndenominator.\n\nWhen the user sets the aggregation interval very high, damon_hot_score()\ncould return a value out of [0, DAMOS_MAX_SCORE] range.  Since the return\nvalue is used as an index to the regions_score_histogram array, which is\nDAMOS_MAX_SCORE+1 size, it causes out of bounds array access.\n\nThe issues can be relatively easily reproduced like below.  The sysfs\nwrite permission is required, though.\n\n    # ./damo start --damos_action lru_prio --damos_quota_space 100M \\\n            --damos_quota_interval 1s\n    # cd /sys/kernel/mm/damon/admin/kdamonds/0\n    # echo 0 > contexts/0/monitoring_attrs/intervals/sample_us\n    # echo 0 > contexts/0/monitoring_attrs/intervals/aggr_us\n    # echo commit > state\n    # dmesg\n    [...]\n    [  131.329762] Oops: divide error: 0000 [#1] SMP NOPTI\n    [...]\n    [  131.336089] RIP: 0010:damon_hot_score+0x27/0xd0\n    [...]\n\nFix the divide-by-zero intervals problems by explicitly handling the zero\nintervals in damon_max_nr_accesses().  Fix the out-of-bound array access\nby applying [0, DAMOS_MAX_SCORE] bounds before returning from\ndamon_hot_score().\n\nThe issue was discovered [1] by Sashiko.","epss":{"date":"2026-11-10","percentile":0.07668,"score":0.0018},"exploits":[],"kev":null,"metrics":[{"score":5.5,"severity":"medium","source":"NVD: nvd@nist.gov","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794505581637,"publishedAt":1784969486072,"references":[{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91"},{"source":"CNA: Linux","tags":[],"url":"https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2"},{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"],"url":"https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a"}],"remediation":[{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046"},{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a"},{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146"},{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91"},{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2"},{"kind":"fix","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a"}],"revision":"3b75f7eb5d4816a77280ba67c4d1cfd53e5d60b7b834374a553dff1b22fcbb85","sources":[{"modifiedAt":1793983492652,"name":"CNA: Linux","retrievedAt":1793985835963,"url":"https://www.cve.org/CVERecord?id=CVE-2026-64458"},{"modifiedAt":1794505581637,"name":"NVD","retrievedAt":1794507347605,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64458"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794462706912,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-64458"}],"ssvc":{"assessedAt":1793983137314,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"mm/damon/ops-common: handle extreme intervals in damon_hot_score()","updatedAt":1794507347605}