Double free in Linux kernel USB ULPI ulpi_register_interface() error path
CVE-2026-31759 is a Linux kernel memory-management flaw in the USB ULPI subsystem. The bug is in the error path of ulpi_register_interface() when device_register() fails during ULPI device registration. In that failure case, ulpi_register() calls put_device() on ulpi->dev. That in turn invokes the device release callback ulpi_dev_release(), which drops the OF node reference and frees the ulpi structure. The vulnerable error path in ulpi_register_interface() then also calls kfree(ulpi), resulting in a double free of the same object. The upstream fix removes the redundant free and relies on put_device() and ulpi_dev_release() to perform cleanup.
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Linux kernel double-free vulnerability in USB ULPI interface registration error handling.
A Linux kernel double-free vulnerability in the USB ULPI subsystem's ulpi_register_interface() error path, where cleanup after device_register() failure could free the same ulpi structure twice.
A Linux kernel double-free vulnerability in the USB ULPI interface registration error path.
Linux kernel double-free vulnerability in USB ULPI interface registration error handling.
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