{"id":"CVE-2026-31502","title":"team: fix header_ops type confusion with non-Ethernet ports","summary":"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 c…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-843"],"vendor":"Linux","product":"Linux","affected":["Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53","Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 6d3161fa3eee64d46b766fb0db33ec7f300ef52d","Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0","Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 20491d384d973a63fbdaf7a71e38d69b0659ea55","Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 425000dbf17373a4ab8be9428f5dc055ef870a56","Linux 3.7"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:10:14.938095Z"},"published":"2026-04-22","updated":"2026-10-19","sourceUpdated":"2026-10-19T18:45:53.793Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31502","references":[{"url":"https://git.kernel.org/stable/c/420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53"},{"url":"https://git.kernel.org/stable/c/6d3161fa3eee64d46b766fb0db33ec7f300ef52d"},{"url":"https://git.kernel.org/stable/c/0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0"},{"url":"https://git.kernel.org/stable/c/20491d384d973a63fbdaf7a71e38d69b0659ea55"},{"url":"https://git.kernel.org/stable/c/425000dbf17373a4ab8be9428f5dc055ef870a56"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31502.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-31502"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460684"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31502"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31502"},{"url":"https://lore.kernel.org/linux-cve-announce/2026042205-CVE-2026-31502-4b98@gregkh/T"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00129,"epssPercentile":0.02529,"scores":{"cna":7.8,"vendor":6.4},"ingestedAt":"2026-10-16T17:24:46.657Z","slug":"CVE-2026-31502","body":"## Overview\n\nIn 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->header_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 -> bond -> 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->dev, 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.\n\n## Affected\n\n- `Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53`\n- `Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 6d3161fa3eee64d46b766fb0db33ec7f300ef52d`\n- `Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0`\n- `Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 20491d384d973a63fbdaf7a71e38d69b0659ea55`\n- `Linux >= 1d76efe1577b4323609b1bcbfafa8b731eda071a < 425000dbf17373a4ab8be9428f5dc055ef870a56`\n- `Linux 3.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31502.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":225145,"id":"CVE-2026-31502","ts":1792438818902,"field":"cvss","old":"6.4","new":"7.8"},{"seq":225144,"id":"CVE-2026-31502","ts":1792438818902,"field":"severity","old":"medium","new":"high"},{"seq":223588,"id":"CVE-2026-31502","ts":1792238326531,"field":"cvss","old":"7.8","new":"6.4"},{"seq":223587,"id":"CVE-2026-31502","ts":1792238326531,"field":"severity","old":"high","new":"medium"}]}