Vulnerability-Lookup

GHSA-X8WX-2R8M-399G

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read

If the fan data becomes 0 between the FAN_DATA_VALID() check and the FAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash due to a race with a concurrent update of the cached fan value.

Fix a TOCTOU issue by reading fan data once.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74546"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:59Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read\n\nIf the fan data becomes 0 between the FAN_DATA_VALID() check and the\nFAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash\ndue to a race with a concurrent update of the cached fan value.\n\nFix a TOCTOU issue by reading fan data once.",
  "id": "GHSA-x8wx-2r8m-399g",
  "modified": "2026-08-19T18:32:30Z",
  "published": "2026-08-15T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74546"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/009240d057e26831cc925feaba4c490209c1d0ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/689a2ea75434131d0af58aeb7d51fde40e858b4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/76963b04b2d1c648d69949d8dd521e1ff7f40b51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/832069bec79cf6f903441c5769d3cdba95d0af33"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96ad57d31763559d376416cdf3bf5ae79bbbebec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d328175045176f85c15c369bd21dc551351e7935"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74546 (GCVE-0-2026-74546)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38

Title

hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read

Summary

In the Linux kernel, the following vulnerability has been resolved: hwmon: (adt7470) Fix divide-by-zero TOCTOU crash in fan speed read If the fan data becomes 0 between the FAN_DATA_VALID() check and the FAN_PERIOD_TO_RPM() conversion, it will result in a divide-by-zero crash due to a race with a concurrent update of the cached fan value. Fix a TOCTOU issue by reading fan data once.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/689a2ea75434131d0…
https://git.kernel.org/stable/c/009240d057e26831c…
https://git.kernel.org/stable/c/d328175045176f85c…
https://git.kernel.org/stable/c/832069bec79cf6f90…
https://git.kernel.org/stable/c/96ad57d31763559d3…
https://git.kernel.org/stable/c/76963b04b2d1c648d…
https://git.kernel.org/stable/c/1b46fe9dc8f8de593…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 689a2ea75434131d0af58aeb7d51fde40e858b4d (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 009240d057e26831cc925feaba4c490209c1d0ba (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < d328175045176f85c15c369bd21dc551351e7935 (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 832069bec79cf6f903441c5769d3cdba95d0af33 (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 96ad57d31763559d376416cdf3bf5ae79bbbebec (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 76963b04b2d1c648d69949d8dd521e1ff7f40b51 (git) Affected: fc958a61ff6d34a0ec42744d3ff524ee202b2e9f , < 1b46fe9dc8f8de59310f37e6c5e5c0e05ded46c3 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-X8WX-2R8M-399G

CVE-2026-74546 (GCVE-0-2026-74546)

Tags

Sightings

Nomenclature