CVE-2026-64458

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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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/damon.h", "mm/damon/ops-common.c"], "versions": [{"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "58321b4e6e4f0f412069ab27ccdd56292757343a", "status": "affected", "versionType": "git"}, {"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "74fef68d521150281e36cdaa20e9e1ee3e3aa146", "status": "affected", "versionType": "git"}, {"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a", "status": "affected", "versionType": "git"}, {"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "9c8f31eaae6140ecadec0c07320498a944556de2", "status": "affected", "versionType": "git"}, {"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "76e415ea88d20f022ed5cfcf78c50e156a267e91", "status": "affected", "versionType": "git"}, {"version": "198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f", "lessThan": "35d4a3cf70a855b50e53189ac2f8463e20a02046", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/linux/damon.h", "mm/damon/ops-common.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.96", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.39", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "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": "5.16", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.96"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.39"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a"}, {"url": "https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146"}, {"url": "https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a"}, {"url": "https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2"}, {"url": "https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91"}, {"url": "https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046"}], "title": "mm/damon/ops-common: handle extreme intervals in damon_hot_score()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64458", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T16:38:57.314626Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-06T16:44:52.652Z"}}]}}

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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. 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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."}], "id": "CVE-2026-64458", "lastModified": "2026-11-12T17:46:21.637", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64458", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:38:57.314626Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:30.943", "references": [{"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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-369"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mm/damon/ops-common: handle extreme intervals in damon_hot_score()", "id": "2507051", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507051"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-369", "details": ["A flaw was found in the Linux kernel's Data Access MONitor (DAMON) subsystem. A local user with write permissions to the system file system (sysfs) can exploit this vulnerability by configuring extreme (zero or excessively high) monitoring intervals. This improper handling of interval values can lead to divide-by-zero errors or out-of-bounds array access, resulting in a kernel crash and a Denial of Service."], "name": "CVE-2026-64458", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64458\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64458\nhttps://lore.kernel.org/linux-cve-announce/2026072542-CVE-2026-64458-fb85@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,58321b4e6e4f0f412069ab27ccdd56292757343a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,74fef68d521150281e36cdaa20e9e1ee3e3aa146)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,76e415ea88d20f022ed5cfcf78c50e156a267e91)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,9c8f31eaae6140ecadec0c07320498a944556de2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f,35d4a3cf70a855b50e53189ac2f8463e20a02046)"}}], "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": "5.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.96,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.39,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "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": "2026-07-25T20:15:02.729636+00:00", "updated": "2026-08-04T14:30:10.624570+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}