CVE-2026-64010: nfc: llcp: Fix use-after-free race in nfc_llcp_recv_cc()

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

nfc: llcp: Fix use-after-free race in nfcllcprecvcc()

A race condition exists in the NFC LLCP connection state machine where the connection acceptance packet (CC) can be processed concurrently with socket release. This can lead to a use-after-free of the socket object.

When nfcllcprecvcc() moves the socket from the connectingsockets list to the sockets list, it does so without holding the socket lock. If llcpsockrelease() is executing concurrently, it might have already unlinked the socket and dropped its references, which can result in nfcllcprecvcc() linking a freed socket into the live list.

Fix this by holding locksock() during the state transition and list movement in nfcllcprecvcc(). After acquiring the lock, check if the socket is still hashed to ensure it hasn't already been unlinked and marked for destruction by the release path. This aligns the locking pattern with recvhdlc() and recvdisc().