CVE-2026-45846

bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

State: Published
Severity: Not scored
Published: May 27, 2026
Updated: Jun 14, 2026
Reserved: May 13, 2026

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, consistent with the xmit paths in the same driver.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 31e010a106ff6cd8ccac4bfee547fd3fa1015574Affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 55193df8d6d33318435f19572bf5ea47a22eee28Affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 51eef9c072aa3405a6823a96ae666d38a3b48750Affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before a0f4e4e8e0f5e24ddd83e3d1221732621cf34636Affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 35a115a204be08f97450b0389413e218268ef4a2Affected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 74a02921c48fcd35a7881956c9e5c52b86595f5dAffected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 638905520fc4fae6a80991563f264131545ba3dfAffected 571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before aa6c6d9ee064aabfede4402fd1283424e649ca19Affected
LinuxLinux	5.7Affected before 5.7Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.141 through 6.6.Not affected 6.12.91 through 6.12.Not affected 6.18.33 through 6.18.Not affected 7.0.10 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 31e010a106ff6cd8ccac4bfee547fd3fa1015574Affected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 55193df8d6d33318435f19572bf5ea47a22eee28Affected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 51eef9c072aa3405a6823a96ae666d38a3b48750Affected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before a0f4e4e8e0f5e24ddd83e3d1221732621cf34636Affected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 35a115a204be08f97450b0389413e218268ef4a2Affected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 74a02921c48fcd35a7881956c9e5c52b86595f5dAffected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before 638905520fc4fae6a80991563f264131545ba3dfAffected
571912c69f0ed731bd1e071ade9dc7ca4aa52065 to before aa6c6d9ee064aabfede4402fd1283424e649ca19Affected

LinuxLinux

5.7Affected
before 5.7Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.141 through 6.6.*Not affected
6.12.91 through 6.12.*Not affected
6.18.33 through 6.18.*Not affected
7.0.10 through 7.0.*Not affected
7.1 and laterNot affected

References

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