In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: Fix not validating setsockopt user input syzbot reported rfcommsocksetsockoptold() is copying data without checking user input length. BUG: KASAN: slab-out-of-bounds in copyfromsockptroffset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copyfromsockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in rfcommsocksetsockoptold net/bluetooth/rfcomm/sock.c:632 [inline] BUG: KASAN: slab-out-of-bounds in rfcommsock_setsockopt+0x893/0xa70 net/bluetooth/rfcomm/sock.c:673 Read of size 4 at addr ffff8880209a8bc3 by task syz-executor632/5064