CVE-2026-74552 (GCVE-0-2026-74552)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:38
VLAI
Title
hwmon: (lm90) Only report alarms if driver is ready
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < 31ce62d36d859423dc39f9902f7c4c307b2e00e3 (git)
Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < 4eed33c7db5c0c573928d28d8a2c003642c679b8 (git)
Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < 70d9a71aa407044d70b50d356b6decf6659c4d56 (git)
Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < 075fce376cf852db9293481edce07c181a9b1f46 (git)
Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < f0b791a006512a48b6348494cb6960598fa99a58 (git)
Affected: f6d0775119fb905fb02eafa98d575cf8ee792d46 , < aa9429edf9fc0e90d6f4da19ea4b5495a54ab117 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (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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{
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          "product": "Linux",
          "programFiles": [
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              "version": "7.1.8",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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"
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    "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"
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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."
          }
        ],
        "id": "CVE-2026-74552",
        "lastModified": "2026-08-19T17:21:10.360",
        "metrics": {},
        "published": "2026-08-15T13:18:00.607",
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      "current_release_date": "2026-08-21T11:33:31+00:00",
      "cve": "CVE-2026-74552",
      "id": "CVE-2026-74552",
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      "product_status:known_affected": "90",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: hwmon: (lm90) Only report alarms if driver is ready",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74552.json",
      "version": "3"
    },
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      "cve": "CVE-2026-74552",
      "id": "CVE-2026-74552",
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      "product_status:known_affected": "30",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74552",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74552.json",
      "version": "4"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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