# CVE-2026-98620: net: ethernet: mtk_eth_soc: unregister net_devices in case of probe failure

CVE-2026-98620 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98620, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98620
- Priority: Routine
- CVSS: 4.4 (Moderate)
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98620

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: ethernet: mtk_eth_soc: unregister net_devices in case of probe failure  If register_netdev() fails for one of the MTK_MAX_DEVS devices in mtk_probe(), the error path jumps to err_deinit_ppe, skipping mtk_unreg_dev(). The previously registered net_devices are then freed by mtk_free_dev() while still in NETREG_REGISTERED state, hitting the BUG_ON(dev->reg_state != NETREG_UNREGISTERED).  Route the register_netdev() failure to err_unreg_netdev so the net_devices registered so far are properly unregistered before being freed.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98620](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98620.md) | Oct 19, 2026 |
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98620](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98620.md) | Oct 19, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-98620](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98620.md) | Oct 19, 2026 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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