CVE-2026-31501 net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path

In the Linux kernel, the following vulnerability has been resolved: net: ti: icssg-prueth: fix use-after-free of CPPI descriptor in RX path cppi5hdescgetpsdata returns a pointer into the CPPI descriptor. In both emacrxpacket and emacrxpacketzc, the descriptor is freed via k3cppidescpoolfree befor...