In the Linux kernel, the following vulnerability has been resolved: um: Add winch to winch_handlers before registering winch IRQ Registering a winch IRQ is racy, an interrupt may occur before the winch is added to the winch_handlers list. If that happens, register_winch_irq() adds to that list a winch that is scheduled to be (or has already been) freed, causing a panic later in winch_cleanup(). Avoid the race by adding the winch to the winch_handlers list before registering the IRQ, and rolling back if um_request_irq() fails. A vulnerability was found in the Linux kernel's handling of winch IRQs. This issue involves the registration of winch IRQs before adding winch handlers to the winch_handlers list. This oversight could potentially lead to improper IRQ handling and impact system stability or security. This issue has been resolved by ensuring that winch handlers are added to the list before the IRQs are registered.
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