CVE-2026-46170

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

mptcp: pm: ADD_ADDR rtx: free sk if last

When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(),

and released at the end.

If at that moment, it was the last reference being held, the sk would

not be freed. sock_put() should then be called instead of __sock_put().

But that's not enough: if it is the last reference, sock_put() will call

sk_free(), which will end up calling sk_stop_timer_sync() on the same

timer, and waiting indefinitely to finish. So it is needed to mark that

the timer is done at the end of the timer handler when it has not been

rescheduled, not to call sk_stop_timer_sync() on "itself".