bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()

{
  "id": "2a8c4e02ecbc9b1549200800ce03dc552517e136d2533ba5b7b4c02f2dc10d21",
  "url": "https://osv.dev/vulnerability/CVE-2026-45846",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bareudp: fix NULL pointer dereference in bareudp_fill_metadata_dst()",
    "summary": "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: 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) Add a NULL check returning -ESHUTDOWN, consistent with the xmit paths in the same driver.",
    "evidence": "osv:CVE-2026-45846",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.258",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.209",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.175",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.91",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.33",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-45846",
      "aliases": [
        "CVE-2026-45846"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "571912c69f0ed731bd1e071ade9dc7ca4aa52065"
                },
                {
                  "fixed": "31e010a106ff6cd8ccac4bfee547fd3fa1015574"
                },
                {
                  "fixed": "55193df8d6d33318435f19572bf5ea47a22eee28"
                },
                {
                  "fixed": "51eef9c072aa3405a6823a96ae666d38a3b48750"
                },
                {
                  "fixed": "a0f4e4e8e0f5e24ddd83e3d1221732621cf34636"
                },
                {
                  "fixed": "35a115a204be08f97450b0389413e218268ef4a2"
                },
                {
                  "fixed": "74a02921c48fcd35a7881956c9e5c52b86595f5d"
                },
                {
                  "fixed": "638905520fc4fae6a80991563f264131545ba3df"
                },
                {
                  "fixed": "aa6c6d9ee064aabfede4402fd1283424e649ca19"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45846.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.7.0"
                },
                {
                  "fixed": "5.10.258"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.209"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.175"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.141"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.91"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.33"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45846.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.657530470Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/31e010a106ff6cd8ccac4bfee547fd3fa1015574",
        "https://git.kernel.org/stable/c/35a115a204be08f97450b0389413e218268ef4a2",
        "https://git.kernel.org/stable/c/51eef9c072aa3405a6823a96ae666d38a3b48750",
        "https://git.kernel.org/stable/c/55193df8d6d33318435f19572bf5ea47a22eee28",
        "https://git.kernel.org/stable/c/638905520fc4fae6a80991563f264131545ba3df",
        "https://git.kernel.org/stable/c/74a02921c48fcd35a7881956c9e5c52b86595f5d",
        "https://git.kernel.org/stable/c/a0f4e4e8e0f5e24ddd83e3d1221732621cf34636",
        "https://git.kernel.org/stable/c/aa6c6d9ee064aabfede4402fd1283424e649ca19",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45846.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-45846",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45846.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-45846",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492219,
  "published_at": "2026-05-27T09:24:52.122+00:00"
}