# CVE-2021-47235: linux: In the Linux kernel, the following vulnerability has been resolved:  net: ethernet: fix potential use-after-free in e...

CVE-2021-47235 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47235, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47235
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: ethernet: fix potential use-after-free in ec_bhf_remove  static void ec_bhf_remove(struct pci_dev *dev) { ... 	struct ec_bhf_priv *priv = netdev_priv(net_dev);  	unregister_netdev(net_dev); 	free_netdev(net_dev);  	pci_iounmap(dev, priv->dma_io); 	pci_iounmap(dev, priv->io); ... }  priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after pci_iounmap() calls.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.46-1 | [DEBIAN-CVE-2021-47235](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47235.md) | May 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.46-1 | [DEBIAN-CVE-2021-47235](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47235.md) | May 21, 2024 |
| Linux | linux Debian 14 | 5.10.46-1 | [DEBIAN-CVE-2021-47235](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47235.md) | May 21, 2024 |

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