Bug 2502568 (CVE-2026-64038)

Summary: CVE-2026-64038 kernel: hwmon: (lm90) Stop work before releasing hwmon device
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's hardware monitoring (hwmon) subsystem. A timing issue in the lm90 driver can cause the system to attempt to access freed memory during module cleanup. This use-after-free vulnerability could lead to system instability and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-07-19 17:06:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

hwmon: (lm90) Stop work before releasing hwmon device

Sashiko reports:

In lm90_probe(), the devm action to cancel the alert_work and report_work
(lm90_restore_conf) is registered in lm90_init_client() before
devm_hwmon_device_register_with_info() is called.

Because devm executes cleanup actions in reverse order during module
unbind or probe failure, the hwmon device is unregistered and freed first.

If lm90_alert_work() or lm90_report_alarms() runs in the window between
the hwmon device being freed and the delayed works being cancelled,
lm90_update_alarms() will dereference the freed data->hwmon_dev here.

Fix the problem by canceling the workers separately after registering
the hwmon device and before registering the interrupt handler. This ensures
that the workers are canceled after interrupts are disabled and before
the hwmon device is released. Add "shutdown" flag to indicate that device
shutdown is in progress to prevent workers from being re-armed.
Comment 1 TEJ RATHI 2026-07-20 09:27:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-64038-16c2@gregkh/T