The Linux kernel's rtw89 PCI wifi driver lacked a .shutdown callback, causing rfkill polling to continue during warm reboot on arm64 platforms. This led to kernel panics triggered by asynchronous SError interrupts when the PCIe link was torn down but polling continued, resulting in MMIO reads to non-responding devices. The fix added a .shutdown callback that sets a shutdown flag, causing rfkill polling to return early and avoid MMIO reads after shutdown begins. This prevents the kernel panic without invoking the full .remove path, keeping shutdown minimal and idempotent.

On affected arm64 platforms, the vulnerability caused kernel panics during warm reboot due to asynchronous SError interrupts triggered by rfkill polling accessing a non-responding PCIe device. This disrupts system stability and reboot processes but does not indicate remote code execution or data compromise.

A fix has been implemented by adding a .shutdown callback in the rtw89 PCI driver to stop rfkill polling during reboot. Systems should apply the updated Linux kernel version containing this fix once available. No additional mitigation steps are indicated.