# CVE-2026-31621: bnge: return after auxiliary_device_uninit() in error path

CVE-2026-31621 is fixed in linux on 1 platform by DEBIAN-CVE-2026-31621 (version 6.19.14-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-31621
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31621

## Description

In the Linux kernel, the following vulnerability has been resolved:  bnge: return after auxiliary_device_uninit() in error path  When auxiliary_device_add() fails, the error block calls auxiliary_device_uninit() but does not return.  The uninit drops the last reference and synchronously runs bnge_aux_dev_release(), which sets bd->auxr_dev = NULL and frees the underlying object.  The subsequent bd->auxr_dev->net = bd->netdev then dereferences NULL, which is not a good thing to have happen when trying to clean up from an error.  Add the missing return, as the auxiliary bus documentation states is a requirement (seems that LLM tools read documentation better than humans do...)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-31621](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31621.md) | May 15, 2026 |

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Data as of 2026-11-10T01:44:33Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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