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CVE-2021-47582 is a Linux kernel USB core flaw in the usbfs handling of the USBDEVFS_CONTROL and USBDEVFS_BULK ioctls. The affected do_proc_control() and do_proc_bulk() paths invoke usb_start_wait_urb() through usb_control_msg() or usb_bulk_msg(), resulting in an uninterruptible wait whose timeout is supplied by the caller. When the supplied timeout is excessively large and the addressed USB device does not respond, the calling task can remain blocked for a prolonged period. The upstream fix replaces these message-helper calls with equivalent usbfs-specific logic that uses killable waits and GFP_KERNEL allocation.
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Linux kernel USB core process-control handling flaw.
A resolved Linux kernel USB core issue involving the do_proc_control() and do_proc_bulk() functions, changed to be killable.
A local Linux kernel USB-core denial-of-service vulnerability in which USBDEVFS_CONTROL and USBDEVFS_BULK ioctl operations can cause an excessively long uninterruptible wait when a user supplies a large timeout and the USB device is unresponsive. The remediation changes these paths to use killable waits.
A Linux kernel USB core flaw in drivers/usb/core/devio.c where USBDEVFS_CONTROL and USBDEVFS_BULK ioctl operations could enter an uninterruptible wait for an attacker- or user-specified, excessively large timeout when a USB device does not respond, resulting in hung tasks. The fix replaces the affected USB message calls with special-purpose logic using a killable wait.
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