In the Linux kernel, the following vulnerability has been resolved:
hwmon: (lm90) Add lock protection to lm90_alert
Sashiko reports:
lm90_alert() executes in the smbus alert context and calls lm90_update_confreg() to disable the hardware alert line, without acquiring hwmon_lock.
Concurrently, sysfs write operations (such as lm90_write_convrate) hold the hwmon_lock, temporarily modify data->config, and then restore it.
If an alert interrupt occurs concurrently with a sysfs write, the sysfs path will overwrite the alert handler's modifications to data->config and the hardware register.
This unintentionally re-enables the hardware alert line while the alarm is still active, causing an interrupt storm.
Add the missing lock to lm90_alert() to solve the problem.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Jul 29, 2026 | Jul 24, 2026 |
| Ubuntu | — | Upgrade linux-image-7.0.0-1009-aws-64kUpgrade linux-image-7.0.0-1015-raspi-realtimeUpgrade linux-image-nvidia-bos-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-nvidiaUpgrade linux-image-7.0.0-2016-nvidia-bosUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-7.0.0-1009-awsUpgrade linux-image-7.0.0-2016-nvidia-bos-64kUpgrade linux-image-nvidia-64k-7.0Upgrade linux-image-aws-64kUpgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-raspi-realtimeUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-gcpUpgrade linux-image-awsUpgrade linux-image-7.0.0-1015-raspiUpgrade linux-image-raspi-realtime-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-azureUpgrade linux-image-nvidia-bosUpgrade linux-image-azure-7.0Upgrade linux-image-nvidia-7.0Upgrade linux-image-7.0.0-1014-azureUpgrade linux-image-raspi-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-bos-64kUpgrade linux-image-aws-7.0Upgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-1016-nvidiaUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-7.0.0-1016-nvidia-64k | Jul 28, 2026 | Jul 28, 2026 |
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