CVE-2026-80830: usb: core: Add lock to usb_wakeup_notification()
In the Linux kernel, the following vulnerability has been resolved:
usb: core: Add lock to usbwakeupnotification()
Add a spin lock to usbwakeup notification to prevent a race condition with dereferencing freed memory. This could be hit by the xHCI driver as it calls this function from an IRQ and could race with the hubdisconnect() function, which properly grabs this lock to protect the state of the device.
Affected Software
Event History
Frequently Asked Questions
What conditions are needed to trigger this issue?
The race involves usb_wakeup_notification() being called from an xHCI driver interrupt while hub_disconnect() is running. The unsafe condition is a wakeup notification dereferencing device state after that memory has been freed during disconnect.
Which systems are most directly exposed?
Linux Kernel systems using the USB core with xHCI activity are the systems explicitly identified in the available information. The issue is associated with concurrent USB wakeup handling and device disconnection.
What is the remediation?
Apply a Linux kernel update that includes the referenced stable fixes. The fix adds a spin lock around usb_wakeup_notification() to synchronize it with hub_disconnect() and protect device state.