CVE-2026-64458 (GCVE-0-2026-64458)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-11-06 16:44
VLAI
Title
mm/damon/ops-common: handle extreme intervals in damon_hot_score()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/damon/ops-common: handle extreme intervals in damon_hot_score() Fix three issues in damon_hot_score() that comes from wrong handling of extreme (zero or too high) monitoring intervals user setup. When the user sets sampling interval zero, damon_max_nr_accesses(), which is called from damon_hot_score(), causes a divide-by-zero. Needless to say, it is a problem. When the user sets the aggregation interval zero, the function returns zero. It is wrong, since the real maximum nr_acceses in the setup should be one. Worse yet, it can cause another divide-by-zero from its caller, damon_hot_score(), since it uses damon_max_nr_accesses() return value as a denominator. When the user sets the aggregation interval very high, damon_hot_score() could return a value out of [0, DAMOS_MAX_SCORE] range. Since the return value is used as an index to the regions_score_histogram array, which is DAMOS_MAX_SCORE+1 size, it causes out of bounds array access. The issues can be relatively easily reproduced like below. The sysfs write permission is required, though. # ./damo start --damos_action lru_prio --damos_quota_space 100M \ --damos_quota_interval 1s # cd /sys/kernel/mm/damon/admin/kdamonds/0 # echo 0 > contexts/0/monitoring_attrs/intervals/sample_us # echo 0 > contexts/0/monitoring_attrs/intervals/aggr_us # echo commit > state # dmesg [...] [ 131.329762] Oops: divide error: 0000 [#1] SMP NOPTI [...] [ 131.336089] RIP: 0010:damon_hot_score+0x27/0xd0 [...] Fix the divide-by-zero intervals problems by explicitly handling the zero intervals in damon_max_nr_accesses(). Fix the out-of-bound array access by applying [0, DAMOS_MAX_SCORE] bounds before returning from damon_hot_score(). The issue was discovered [1] by Sashiko.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 16:38 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < 58321b4e6e4f0f412069ab27ccdd56292757343a (git)
Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < 74fef68d521150281e36cdaa20e9e1ee3e3aa146 (git)
Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a (git)
Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < 9c8f31eaae6140ecadec0c07320498a944556de2 (git)
Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < 76e415ea88d20f022ed5cfcf78c50e156a267e91 (git)
Affected: 198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f , < 35d4a3cf70a855b50e53189ac2f8463e20a02046 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-11-06T16:38:57.314626Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-11-06T16:38:58.954Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "include/linux/damon.h",
                "mm/damon/ops-common.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "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",
              "programFiles": [
                "include/linux/damon.h",
                "mm/damon/ops-common.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "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"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "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": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.96",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18.39",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.1.4",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "7.2",
                      "versionStartIncluding": "5.16",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "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 \u003e contexts/0/monitoring_attrs/intervals/sample_us\n    # echo 0 \u003e contexts/0/monitoring_attrs/intervals/aggr_us\n    # echo commit \u003e 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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-17T04:56:02.857Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64458",
        "datePublished": "2026-07-25T08:51:26.072Z",
        "dateReserved": "2026-07-19T15:36:31.789Z",
        "dateUpdated": "2026-11-06T16:44:52.652Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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