CVE-2023-52907

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nfc: pn533: Wait for out_urb&amp;#39;s completion in pn533_usb_send_frame()<br /> <br /> Fix a use-after-free that occurs in hcd when in_urb sent from<br /> pn533_usb_send_frame() is completed earlier than out_urb. Its callback<br /> frees the skb data in pn533_send_async_complete() that is used as a<br /> transfer buffer of out_urb. Wait before sending in_urb until the<br /> callback of out_urb is called. To modify the callback of out_urb alone,<br /> separate the complete function of out_urb and ack_urb.<br /> <br /> Found by a modified version of syzkaller.<br /> <br /> BUG: KASAN: use-after-free in dummy_timer<br /> Call Trace:<br /> memcpy (mm/kasan/shadow.c:65)<br /> dummy_perform_transfer (drivers/usb/gadget/udc/dummy_hcd.c:1352)<br /> transfer (drivers/usb/gadget/udc/dummy_hcd.c:1453)<br /> dummy_timer (drivers/usb/gadget/udc/dummy_hcd.c:1972)<br /> arch_static_branch (arch/x86/include/asm/jump_label.h:27)<br /> static_key_false (include/linux/jump_label.h:207)<br /> timer_expire_exit (include/trace/events/timer.h:127)<br /> call_timer_fn (kernel/time/timer.c:1475)<br /> expire_timers (kernel/time/timer.c:1519)<br /> __run_timers (kernel/time/timer.c:1790)<br /> run_timer_softirq (kernel/time/timer.c:1803)