CVE-2026-74552

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.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46
https://git.kernel.org/stable/c/31ce62d36d859423dc39f9902f7c4c307b2e00e3
https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8
https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56
https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117
https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 13:18

Updated : 2026-08-19 17:21

NVD link : CVE-2026-74552

Mitre link : CVE-2026-74552

CVE.ORG link : CVE-2026-74552

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-74552", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "31ce62d36d859423dc39f9902f7c4c307b2e00e3", "versionType": "git"}, {"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "4eed33c7db5c0c573928d28d8a2c003642c679b8", "versionType": "git"}, {"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "70d9a71aa407044d70b50d356b6decf6659c4d56", "versionType": "git"}, {"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "075fce376cf852db9293481edce07c181a9b1f46", "versionType": "git"}, {"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "f0b791a006512a48b6348494cb6960598fa99a58", "versionType": "git"}, {"status": "affected", "version": "f6d0775119fb905fb02eafa98d575cf8ee792d46", "lessThan": "aa9429edf9fc0e90d6f4da19ea4b5495a54ab117", "versionType": "git"}], "programFiles": ["drivers/hwmon/lm90.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.0"}, {"status": "unaffected", "version": "0", "lessThan": "6.0", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.151", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.103", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.44", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/hwmon/lm90.c"], "defaultStatus": "affected"}]}], "published": "2026-08-15T13:18:00.607", "references": [{"url": "https://git.kernel.org/stable/c/075fce376cf852db9293481edce07c181a9b1f46", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/31ce62d36d859423dc39f9902f7c4c307b2e00e3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4eed33c7db5c0c573928d28d8a2c003642c679b8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/70d9a71aa407044d70b50d356b6decf6659c4d56", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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->hwmon_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->hwmon_dev to hwmon_notify_event() and triggers a NULL pointer\ndereference.\n\nFix the problem by only scheduling the report and alert workers\ndata->hwmon_dev is set."}], "lastModified": "2026-08-19T17:21:10.360", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}