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

CVE-2026-43219 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-43219, released May 15, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-43219
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 6, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43219

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2026-43219](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43219.md) | May 15, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.94-1 | [DEBIAN-CVE-2026-43219](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43219.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.6-1 | [DEBIAN-CVE-2026-43219](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43219.md) | May 15, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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