CVE-2026-45846
bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 31e010a106ff6cd8ccac4bfee547fd3fa1015574 (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 55193df8d6d33318435f19572bf5ea47a22eee28 (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 51eef9c072aa3405a6823a96ae666d38a3b48750 (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < a0f4e4e8e0f5e24ddd83e3d1221732621cf34636 (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 35a115a204be08f97450b0389413e218268ef4a2 (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 74a02921c48fcd35a7881956c9e5c52b86595f5d (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < 638905520fc4fae6a80991563f264131545ba3df (affected, git) ≥ 571912c69f0ed731bd1e071ade9dc7ca4aa52065; < aa6c6d9ee064aabfede4402fd1283424e649ca19 (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
5.7 (affected) ≥ 0; < 5.7 (unaffected, semver) ≥ 5.10.258; ≤ 5.10.* (unaffected, semver) ≥ 5.15.209; ≤ 5.15.* (unaffected, semver) ≥ 6.1.175; ≤ 6.1.* (unaffected, semver) ≥ 6.6.141; ≤ 6.6.* (unaffected, semver) ≥ 6.12.91; ≤ 6.12.* (unaffected, semver) ≥ 6.18.33; ≤ 6.18.* (unaffected, semver) ≥ 7.0.10; ≤ 7.0.* (unaffected, semver) ≥ 7.1; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574CNA: Linux
- https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28CNA: Linux
- https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750CNA: Linux
- https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636CNA: Linux
- https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2CNA: Linux
- https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5dCNA: Linux
- https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3dfCNA: Linux
- https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19CNA: Linux
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