CVE-2026-74552 (GCVE-0-2026-74552)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:38
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (lm90) Only report alarms if driver is ready Userspace can read sysfs attributes before driver registration is complete, immediately after devm_hwmon_device_register_with_info() has been called. At that time, data->hwmon_dev is not yet initialized. This can trigger a NULL pointer access since lm90_update_device() and with it lm90_update_alarms_locked() will be called. This call schedules report_work and lm90_report_alarms(), which passes the still-NULL data->hwmon_dev to hwmon_notify_event() and triggers a NULL pointer dereference. Fix the problem by only scheduling the report and alert workers data->hwmon_dev is set.
References
Impacted products
Vendor Product Version
Linux Linux Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
Version: f6d0775119fb905fb02eafa98d575cf8ee792d46
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/hwmon/lm90.c"
          ],
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          "vendor": "Linux",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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                {
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (lm90) Only report alarms if driver is ready\n\nUserspace can read sysfs attributes before driver registration is complete,\nimmediately after devm_hwmon_device_register_with_info() has been called.\nAt that time, data-\u003ehwmon_dev is not yet initialized. This can trigger\na NULL pointer access since lm90_update_device() and with it\nlm90_update_alarms_locked() will be called. This call schedules\nreport_work and lm90_report_alarms(), which passes the still-NULL\ndata-\u003ehwmon_dev to hwmon_notify_event() and triggers a NULL pointer\ndereference.\n\nFix the problem by only scheduling the report and alert workers\ndata-\u003ehwmon_dev is set."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:38:49.811Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/31ce62d36d859423dc39f9902f7c4c307b2e00e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56"
        },
        {
          "url": "https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46"
        },
        {
          "url": "https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58"
        },
        {
          "url": "https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117"
        }
      ],
      "title": "hwmon: (lm90) Only report alarms if driver is ready",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74552",
    "datePublished": "2026-08-15T12:27:58.829Z",
    "dateReserved": "2026-08-15T05:44:03.915Z",
    "dateUpdated": "2026-08-19T16:38:49.811Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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