{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31502", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.104Z", "datePublished": "2026-04-22T13:54:22.481Z", "dateUpdated": "2026-08-05T12:23:05.931Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:23:05.931Z" }, "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->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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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 -> bond -> 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's 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/team/team_core.c" ], "versions": [ { "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a", "lessThan": "420e5aad7ba89e8f79e2dc8327b0c0c24c1c1d53", "status": "affected", "versionType": "git" }, { "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a", "lessThan": "6d3161fa3eee64d46b766fb0db33ec7f300ef52d", "status": "affected", "versionType": "git" }, { "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a", "lessThan": "0a7468ed49a6b65d34abcc6eb60e15f7f6d34da0", "status": "affected", "versionType": "git" }, { "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a", "lessThan": "20491d384d973a63fbdaf7a71e38d69b0659ea55", "status": "affected", "versionType": "git" }, { "version": "1d76efe1577b4323609b1bcbfafa8b731eda071a", "lessThan": "425000dbf17373a4ab8be9428f5dc055ef870a56", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/team/team_core.c" ], "versions": [ { "version": "3.7", "status": "affected" }, { "version": "0", "lessThan": "3.7", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.0" } ] } ] } ], "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" } ], "title": "team: fix header_ops type confusion with non-Ethernet ports", "x_generator": { "engine": "bippy-1.2.0" } } } }