CVE-2026-31502 (GCVE-0-2026-31502)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-10-30 12:24
VLAI
Title
team: fix header_ops type confusion with non-Ethernet ports
Summary
In the Linux kernel, the following vulnerability has been resolved: team: fix header_ops type confusion with non-Ethernet ports Similar to commit 950803f72547 ("bonding: fix type confusion in bond_setup_by_slave()") team has the same class of header_ops type confusion. For non-Ethernet ports, team_setup_by_port() copies port_dev->header_ops directly. When the team device later calls dev_hard_header() or dev_parse_header(), these callbacks can run with the team net_device instead of the real lower device, so netdev_priv(dev) is interpreted as the wrong private type and can crash. The syzbot report shows a crash in bond_header_create(), but the root cause is in team: the topology is gre -> bond -> team, and team calls the inherited header_ops with its own net_device instead of the lower device, so bond_header_create() receives a team device and interprets netdev_priv() as bonding private data, causing a type confusion crash. Fix this by introducing team header_ops wrappers for create/parse, selecting a team port under RCU, and calling the lower device callbacks with port->dev, so each callback always sees the correct net_device context. Also pass the selected lower device to the lower parse callback, so recursion is bounded in stacked non-Ethernet topologies and parse callbacks always run with the correct device context.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:10 UTC
CWE
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < c6e255b0ce30cdea37e34d6d87e2212eb8c7f7a4 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 6d3161fa3eee64d46b766fb0db33ec7f300ef52d (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 20491d384d973a63fbdaf7a71e38d69b0659ea55 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 425000dbf17373a4ab8be9428f5dc055ef870a56 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nteam: corrige la confusi\u00f3n de tipo de header_ops con puertos que no son Ethernet\n\nSimilar al commit 950803f72547 (\u2019bonding: corrige la confusi\u00f3n de tipo en bond_setup_by_slave()\u2019), team tiene la misma clase de confusi\u00f3n de tipo de header_ops.\n\nPara puertos que no son Ethernet, team_setup_by_port() copia port_dev  -\u003e  header_ops directamente. Cuando el dispositivo team llama m\u00e1s tarde a dev_hard_header() o dev_parse_header(), estas devoluciones de llamada pueden ejecutarse con el net_device del team en lugar del dispositivo inferior real, por lo que netdev_priv(dev) se interpreta como el tipo privado incorrecto y puede causar un fallo.\n\nEl informe de syzbot muestra un fallo en bond_header_create(), pero la causa ra\u00edz est\u00e1 en team: la topolog\u00eda es gre   -\u003e   bond   -\u003e   team, y team llama a los header_ops heredados con su propio net_device en lugar del dispositivo inferior, por lo que bond_header_create() recibe un dispositivo team e interpreta netdev_priv() como datos privados de bonding, causando un fallo por confusi\u00f3n de tipo.\n\nSoluciona esto introduciendo envoltorios de header_ops de team para create/parse, seleccionando un puerto de team bajo RCU, y llamando a las devoluciones de llamada del dispositivo inferior con port  -\u003e  dev, para que cada devoluci\u00f3n de llamada siempre vea el contexto net_device correcto.\n\nTambi\u00e9n pasa el dispositivo inferior seleccionado a la devoluci\u00f3n de llamada de an\u00e1lisis inferior, para que la recursi\u00f3n est\u00e9 limitada en topolog\u00edas apiladas que no son Ethernet y las devoluciones de llamada de an\u00e1lisis siempre se ejecuten con el contexto de dispositivo correcto."
          }
        ],
        "id": "CVE-2026-31502",
        "lastModified": "2026-11-11T23:10:00.263",
        "metrics": {
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                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "vulnStatus": "Modified",
        "weaknesses": [
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                "value": "CWE-843"
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            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T04:17:57+00:00",
      "cve": "CVE-2026-31502",
      "id": "CVE-2026-31502",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_affected": "109",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: team: fix header_ops type confusion with non-Ethernet ports",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31502.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
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            "metrics": [
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                  "content": {
                    "id": "CVE-2026-31502",
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                        "Automatable": "no"
                      },
                      {
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                      }
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                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:10:14.938095Z",
                    "version": "2.0.3"
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            "problemTypes": [
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                "descriptions": [
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                    "cweId": "CWE-843",
                    "description": "CWE-843 Access of Resource Using Incompatible Type (\u0027Type Confusion\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:10:15.583Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
        "cna": {
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                    {
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                    },
                    {
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                    },
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            {
              "lang": "en",
              "value": "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."
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                  "value": "AV:L - An attacker reaches the vulnerable team header_ops path by locally creating/enslaving network devices through rtnetlink and then triggering dev_hard_header()/dev_parse_header() via local packet/socket or network-stack activity on the malformed team device. The required setup is a local kernel networking configuration path rather than an unauthenticated packet-processing path.\nAC:L - The vulnerable topology, such as GRE -\u003e bond -\u003e team, is fully attacker-controlled once the required namespace capabilities are available, and triggering the bad callback is deterministic. There is no race or external timing condition required.\nPR:L - Creating team/bond/GRE devices and enslaving them requires CAP_NET_ADMIN, and packet sockets require CAP_NET_RAW, but both are available to an unprivileged user inside a user and network namespace on systems permitting unprivileged user namespaces. This is therefore low privileges, not real init-namespace root.\nUI:N - No victim interaction is required after the attacker has local access and namespace capabilities. The attacker can configure the devices and trigger the callback directly.\nS:U - The impact is within the same kernel security authority. This is a kernel crash/type-confusion or privilege-impact issue, not a VM escape or cross-scope boundary violation.\nC:H - The bug is a header_ops type confusion where callbacks interpret team private data as another subsystem\u0027s private structure, causing attacker-influenced kernel pointer dereferences and potential kernel memory exposure. Following the higher-severity rule for type confusion, confidentiality impact is high.\nI:H - Type confusion in kernel callback dispatch can lead to misinterpreted object pointers and potentially control-flow or write-primitive exploitation beyond the observed crash. Kernel type confusion is scored as high integrity impact.\nA:H - The reported and expected failure mode is a kernel oops/BUG/crash when the inherited callback uses the wrong net_device private layout. This gives high availability impact."
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        "dateReserved": "2026-03-09T15:48:24.104Z",
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}



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