GHSA-CCXM-23RV-P7VF

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-15 15:30
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74552"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:18:00Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-ccxm-23rv-p7vf",
  "modified": "2026-08-15T15:30:36Z",
  "published": "2026-08-15T15:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74552"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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