{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1d76efe1577b4323609b1bcbfafa8b731eda071a"
            },
            {
              "fixed": "6d3161fa3eee64d46b766fb0db33ec7f300ef52d"
            },
            {
              "fixed": "0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0"
            },
            {
              "fixed": "20491d384d973a63fbdaf7a71e38d69b0659ea55"
            },
            {
              "fixed": "425000dbf17373a4ab8be9428f5dc055ef870a56"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.7.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31502.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nteam: fix header_ops type confusion with non-Ethernet ports\n\nSimilar to commit 950803f72547 (\"bonding: fix type confusion in\nbond_setup_by_slave()\") team has the same class of header_ops type\nconfusion.\n\nFor non-Ethernet ports, team_setup_by_port() copies port_dev-\u003eheader_ops\ndirectly. When the team device later calls dev_hard_header() or\ndev_parse_header(), these callbacks can run with the team net_device\ninstead of the real lower device, so netdev_priv(dev) is interpreted as\nthe wrong private type and can crash.\n\nThe syzbot report shows a crash in bond_header_create(), but the root\ncause is in team: the topology is gre -\u003e bond -\u003e team, and team calls\nthe inherited header_ops with its own net_device instead of the lower\ndevice, so bond_header_create() receives a team device and interprets\nnetdev_priv() as bonding private data, causing a type confusion crash.\n\nFix this by introducing team header_ops wrappers for create/parse,\nselecting a team port under RCU, and calling the lower device callbacks\nwith port-\u003edev, so each callback always sees the correct net_device\ncontext.\n\nAlso pass the selected lower device to the lower parse callback, so\nrecursion is bounded in stacked non-Ethernet topologies and parse\ncallbacks always run with the correct device context.",
  "id": "CVE-2026-31502",
  "modified": "2026-07-08T05:38:16.284230766Z",
  "published": "2026-04-22T13:54:22.481Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/20491d384d973a63fbdaf7a71e38d69b0659ea55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/425000dbf17373a4ab8be9428f5dc055ef870a56"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d3161fa3eee64d46b766fb0db33ec7f300ef52d"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31502.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31502"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "team: fix header_ops type confusion with non-Ethernet ports"
}