Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

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.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/58321b4e6e4f0f412…
https://git.kernel.org/stable/c/74fef68d521150281…
https://git.kernel.org/stable/c/ef2ae10a4582bc92b…
https://git.kernel.org/stable/c/9c8f31eaae6140eca…
https://git.kernel.org/stable/c/76e415ea88d20f022…
https://git.kernel.org/stable/c/35d4a3cf70a855b50…

Impacted products

2 products

Vendor	Product	Version
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)
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-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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    "datePublished": "2026-07-25T08:51:26.072Z",
    "dateReserved": "2026-07-19T15:36:31.789Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/linux/damon.h\",\"mm/damon/ops-common.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"58321b4e6e4f0f412069ab27ccdd56292757343a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"74fef68d521150281e36cdaa20e9e1ee3e3aa146\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"9c8f31eaae6140ecadec0c07320498a944556de2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"76e415ea88d20f022ed5cfcf78c50e156a267e91\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"198f0f4c58b9f481e4e51c8c70a6ab9852bbab7f\",\"lessThan\":\"35d4a3cf70a855b50e53189ac2f8463e20a02046\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/linux/damon.h\",\"mm/damon/ops-common.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:56Z",
      "cve": "CVE-2026-64458",
      "id": "CVE-2026-64458",
      "initial_release_date": "2026-07-25T15:58:56Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64458",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64458.json",
      "version": "2"
    }
  }
}

GHSA-FHQC-6XWP-7X74

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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.

Show details on source website

JSON

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  "affected": [],
  "aliases": [
    "CVE-2026-64458"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:30Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-fhqc-6xwp-7x74",
  "modified": "2026-07-25T12:31:36Z",
  "published": "2026-07-25T12:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64458"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35d4a3cf70a855b50e53189ac2f8463e20a02046"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/58321b4e6e4f0f412069ab27ccdd56292757343a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/74fef68d521150281e36cdaa20e9e1ee3e3aa146"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76e415ea88d20f022ed5cfcf78c50e156a267e91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c8f31eaae6140ecadec0c07320498a944556de2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ef2ae10a4582bc92b7e944181bbd2f87f3d30f3a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

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

GHSA-FHQC-6XWP-7X74

Tags

Sightings

Nomenclature