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

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54
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 ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux 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: 6.12.80 , ≤ 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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          "programFiles": [
            "drivers/net/team/team_core.c"
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          "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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        "dateUpdated": "2026-04-22T13:54:22.481Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "cveId": "CVE-2026-31502",
    "datePublished": "2026-04-22T13:54:22.481Z",
    "dateReserved": "2026-03-09T15:48:24.104Z",
    "dateUpdated": "2026-04-22T13:54:22.481Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31502\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:48.713\",\"lastModified\":\"2026-04-22T14:16:48.713\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20491d384d973a63fbdaf7a71e38d69b0659ea55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/425000dbf17373a4ab8be9428f5dc055ef870a56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6d3161fa3eee64d46b766fb0db33ec7f300ef52d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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}


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