CVE-2025-38720

In the Linux kernel, the following vulnerability has been resolved:

net: hibmcge: fix rtnl deadlock issue

Currently, the hibmcge netdev acquires the rtnl_lock in

pci_error_handlers.reset_prepare() and releases it in

pci_error_handlers.reset_done().

However, in the PCI framework:

pci_reset_bus - __pci_reset_slot - pci_slot_save_and_disable_locked -

pci_dev_save_and_disable - err_handler->reset_prepare(dev);

In pci_slot_save_and_disable_locked():

list_for_each_entry(dev, &slot->bus->devices, bus_list) {

if (!dev->slot || dev->slot!= slot)

continue;

pci_dev_save_and_disable(dev);

if (dev->subordinate)

pci_bus_save_and_disable_locked(dev->subordinate);

}

This will iterate through all devices under the current bus and execute

err_handler->reset_prepare(), causing two devices of the hibmcge driver

to sequentially request the rtnl_lock, leading to a deadlock.

Since the driver now executes netif_device_detach()

before the reset process, it will not concurrently with

other netdev APIs, so there is no need to hold the rtnl_lock now.

Therefore, this patch removes the rtnl_lock during the reset process and

adjusts the position of HBG_NIC_STATE_RESETTING to ensure

that multiple resets are not executed concurrently.