UBUNTU-CVE-2026-80939: Medium severity ubuntu/linux-hwe-edge vulnerability

In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: pci: add .shutdown callback to stop rfkill polling on reboot Since the hardware rfkill polling was introduced, arm64 platforms can panic with an asynchronous SError during warm reboot: SError Interrupt on CPU8, code 0x00000000be000011 -- SError Workqueue: eventspowerefficient rfkillpoll [rfkill] rtw89pciopsread8+0x94/0x160 [rtw89pci] rtw89corerfkillpoll+0x50/0x1e0 [rtw89core] rtw89opsrfkillpoll+0x40/0x68 [rtw89core] ieee80211rfkillpoll+0x3c/0x70 [mac80211] cfg80211rfkillpoll+0x40/0x2a0 [cfg80211] rfkillpoll+0x30/0x88 [rfkill] Kernel panic - not syncing: Asynchronous SError Interrupt On the reboot path the kernel only runs deviceshutdown(), which calls each driver's .shutdown callback; .remove is not invoked. The rtw89 PCI driver had no .shutdown callback, so nothing stopped the rfkill polling work while the platform was tearing the PCIe link down. Once the link is gone, the next MMIO read from the poll handler targets a non-responding device and is reported as a fatal asynchronous SError on arm64. Add rtw89pcishutdown(), wired to all rtw89 PCI device drivers, which sets a new RTW89FLAGSHUTDOWN flag (mirroring the USB RTW89FLAGUNPLUGGED pattern). When the flag is set, rtw89opsrfkillpoll() returns early, so no MMIO read is issued to the chip after shutdown begins and the SError no longer occurs. This does not call the full .remove path from .shutdown, to keep the shutdown handler minimal and avoid running the non-idempotent teardown twice.