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CVE-2026-43219: net: cpsw_new: Fix potential unregister of netdev that has not been registered yet

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-07-04

Description

In the Linux kernel, the following vulnerability has been resolved: net: cpsw_new: Fix potential unregister of netdev that has not been registered yet If an error occurs during register_netdev() for the first MAC in cpsw_register_ports(), even though cpsw->slaves[0].ndev is set to NULL, cpsw->slaves[1].ndev would remain unchanged. This could later cause cpsw_unregister_ports() to attempt unregistering the second MAC. To address this, add a check for ndev->reg_state before calling unregister_netdev(). With this change, setting cpsw->slaves[i].ndev to NULL becomes unnecessary and can be removed accordingly.

Affected products

• Linux kernel: from 5.5 before 6.18.16; from 6.19 before 6.19.6 — fixed in 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.18.16, 6.19.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14645799ad5253a028cf662e2f9cd18a68f74b31
• https://git.kernel.org/stable/c/23acc565186ee27e788408cbd81b92730b6aaa3a
• https://git.kernel.org/stable/c/29739ec197ed66535bc0b86f14ab66c5f4512138
• https://git.kernel.org/stable/c/349c4cac6f54a81fc107589771f88136a2b20415
• https://git.kernel.org/stable/c/67cca9df4d17f2c824655d31195b2e75334ae286
• https://git.kernel.org/stable/c/9d724b34fbe13b71865ad0906a4be97571f19cf5
• https://git.kernel.org/stable/c/d31a12cee10bbc12b4b523a4709fd1fdee8b7d0f
• https://git.kernel.org/stable/c/da8e1623a3028e1d8c75eec7898d94c6f17dce40

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