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

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-08-05 12:23
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 6d3161fa3eee64d46b766fb0db33ec7f300ef52d (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 20491d384d973a63fbdaf7a71e38d69b0659ea55 (git)
Affected: 1d76efe1577b4323609b1bcbfafa8b731eda071a , < 425000dbf17373a4ab8be9428f5dc055ef870a56 (git)
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Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (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)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T17:14:07+00:00",
      "cve": "CVE-2026-31502",
      "id": "CVE-2026-31502",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:known_affected": "108",
      "product_status:known_not_affected": "166",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:10:36Z",
      "cve": "CVE-2026-31502",
      "id": "CVE-2026-31502",
      "initial_release_date": "2026-04-23T01:25:18Z",
      "product_status:first_fixed": "102",
      "product_status:known_affected": "666",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "314",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31502",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31502.json",
      "version": "18"
    }
  }
}



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