CVE-2021-47235: net: ethernet: fix potential use-after-free in ec_bhf_remove
First published: Tue May 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.15<4.4.274 | |
| Linux Linux kernel | >=4.5<4.9.274 | |
| Linux Linux kernel | >=4.10<4.14.238 | |
| Linux Linux kernel | >=4.15<4.19.196 | |
| Linux Linux kernel | >=4.20<5.4.128 | |
| Linux Linux kernel | >=5.5<5.10.46 | |
| Linux Linux kernel | >=5.11<5.12.13 | |
| Linux Linux kernel | =5.13-rc1 | |
| Linux Linux kernel | =5.13-rc2 | |
| Linux Linux kernel | =5.13-rc3 | |
| Linux Linux kernel | =5.13-rc4 | |
| Linux Linux kernel | =5.13-rc5 | |
| Linux Linux kernel | =5.13-rc6 |
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Reference Links
- https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8
- https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6
- https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb
- https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2
- https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a
- https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea
- https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130
- https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6
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