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CVE-2026-45846 is a NULL pointer dereference vulnerability in the Linux kernel bareudp driver. In bareudp_fill_metadata_dst(), the IPv6 path passes bareudp->sock to udp_tunnel6_dst_lookup() without first verifying that the socket pointer is non-NULL. The bareudp socket is initialized in bareudp_open() and cleared in bareudp_stop(), so if bareudp_fill_metadata_dst() is invoked while the device is down, the code can dereference a NULL socket via sock->sk inside udp_tunnel6_dst_lookup(). The provided crash trace shows the fault occurring in udp_tunnel6_dst_lookup() and being reachable through Open vSwitch action execution paths, including do_execute_actions(), ovs_execute_actions(), and ovs_packet_cmd_execute(). The upstream fix adds a NULL check and returns -ESHUTDOWN, matching the behavior already used in the driver's transmit paths.
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