CVE-2026-45846

/// Technical description

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

bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

bareudp_fill_metadata_dst() passes bareudp->sock to

udp_tunnel6_dst_lookup() in the IPv6 path without a NULL check.

The socket is only created in bareudp_open() and NULLed in

bareudp_stop(), so calling this function while the device is down

triggers a NULL dereference via sock->sk.

BUG: kernel NULL pointer dereference, address: 0000000000000018

RIP: 0010:udp_tunnel6_dst_lookup (net/ipv6/ip6_udp_tunnel.c:160)

Call Trace:

<TASK>

bareudp_fill_metadata_dst (drivers/net/bareudp.c:532)

do_execute_actions (net/openvswitch/actions.c:901)

ovs_execute_actions (net/openvswitch/actions.c:1589)

ovs_packet_cmd_execute (net/openvswitch/datapath.c:700)

genl_family_rcv_msg_doit (net/netlink/genetlink.c:1114)

genl_rcv_msg (net/netlink/genetlink.c:1209)

netlink_rcv_skb (net/netlink/af_netlink.c:2550)

</TASK>

Add a NULL check returning -ESHUTDOWN

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References