{"id":"CVE-2026-74552","state":"PUBLISHED","title":"hwmon: (lm90) Only report alarms if driver is ready","description":"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.","publishedAt":"2026-08-15T12:27:58.829Z","updatedAt":"2026-08-19T16:38:49.811Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"31ce62d36d859423dc39f9902f7c4c307b2e00e3","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"4eed33c7db5c0c573928d28d8a2c003642c679b8","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"70d9a71aa407044d70b50d356b6decf6659c4d56","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"075fce376cf852db9293481edce07c181a9b1f46","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"f0b791a006512a48b6348494cb6960598fa99a58","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"aa9429edf9fc0e90d6f4da19ea4b5495a54ab117","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/lm90.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/lm90.c"]}],"references":["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/075fce376cf852db9293481edce07c181a9b1f46","https://git.kernel.org/stable/c/f0b791a006512a48b6348494cb6960598fa99a58","https://git.kernel.org/stable/c/aa9429edf9fc0e90d6f4da19ea4b5495a54ab117"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74552.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74552","state":"PUBLISHED","datePublished":"2026-08-15T12:27:58.829Z","dateUpdated":"2026-08-19T16:38:49.811Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.915Z"},"containers":{"cna":{"title":"hwmon: (lm90) Only report alarms if driver is ready","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"31ce62d36d859423dc39f9902f7c4c307b2e00e3","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"4eed33c7db5c0c573928d28d8a2c003642c679b8","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"70d9a71aa407044d70b50d356b6decf6659c4d56","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"075fce376cf852db9293481edce07c181a9b1f46","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"f0b791a006512a48b6348494cb6960598fa99a58","versionType":"git"},{"version":"f6d0775119fb905fb02eafa98d575cf8ee792d46","status":"affected","lessThan":"aa9429edf9fc0e90d6f4da19ea4b5495a54ab117","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/lm90.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.151","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.103","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/hwmon/lm90.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:38:49.811Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}