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CVE-2021-47235

Disclosure Date: May 21, 2024 •
CVE-2021-47235
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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.

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CVSS V3 Severity and Metrics
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General Information

Offensive Application
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OS
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Vulnerable Versions
Linux db2bc3cfd2bc
Linux not down converted
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Vendors

  • Linux

Products

  • Linux
Technical Analysis