In the Linux kernel, the following vulnerability has been resolved:

nfc: rawsock: cancel tx_work before socket teardown

In rawsock_release(), cancel any pending tx_work and purge the write
queue before orphaning the socket.  rawsock_tx_work runs on the system
workqueue and calls nfc_data_exchange which dereferences the NCI
device.  Without synchronization, tx_work can race with socket and
device teardown when a process is killed (e.g. by SIGKILL), leading
to use-after-free or leaked references.

Set SEND_SHUTDOWN first so that if tx_work is already running it will
see the flag and skip transmitting, then use cancel_work_sync to wait
for any in-progress execution to finish, and finally purge any
remaining queued skbs.