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team: fix header_ops type confusion with non-Ethernet ports

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-31502

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-31502

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a",
        "lessThan": "420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a",
        "lessThan": "6d3161fa3eee64d46b766fb0db33ec7f300ef52d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a",
        "lessThan": "0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a",
        "lessThan": "20491d384d973a63fbdaf7a71e38d69b0659ea55",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a",
        "lessThan": "425000dbf17373a4ab8be9428f5dc055ef870a56",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/team/team_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.21",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.11",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/team/team_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31502

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39909 · Revision 1
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Publisher date
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