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| Vulnerability ID | VCID-93h7-cr4j-sbfn |
| Aliases |
CVE-2026-31502
|
| 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.3 |
| Risk | 3.1 |
| Affected and Fixed Packages | Package Details |
| System | Score | Found at |
|---|---|---|
| cvssv3 | 6.4 | https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31502.json |
| cvssv3 | 7.0 | https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-31502.json |
| epss | 0.00013 | https://api.first.org/data/v1/epss?cve=CVE-2026-31502 |
| epss | 0.00013 | https://api.first.org/data/v1/epss?cve=CVE-2026-31502 |
| epss | 0.00018 | https://api.first.org/data/v1/epss?cve=CVE-2026-31502 |
| epss | 0.00018 | https://api.first.org/data/v1/epss?cve=CVE-2026-31502 |
| cvssv3.1 | 6.4 | https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Percentile | 0.02379 |
| EPSS Score | 0.00013 |
| Published At | April 29, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-04-23T05:41:07.638340+00:00 | Debian Importer | Import | https://security-tracker.debian.org/tracker/data/json | 38.4.0 |