CVE-2021-47235

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < db2bc3cfd2bc01621014d4f17cdfc74611f339c8affected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < 1cafc540b7bf1b6a5a77dc000205fe337ef6eba6affected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < b1ad283755095a4b9d1431aeb357d7df1a33d3bbaffected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < 0260916843cc74f3906acf8b6f256693e01530a2affected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < 19f88ca68ccf8771276a606765239b167654f84aaffected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < 95deeb29d831e2fae608439e243e7a520611e7eaaffected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < d11d79e52ba080ee567cb7d7eb42a5ade60a8130affected
LinuxLinux6af55ff52b02d492d45db88df3e461fa51a6f753 < 9cca0c2d70149160407bda9a9446ce0c29b6e6c6affected
LinuxLinux3.15affected
LinuxLinux0 < 3.15unaffected
LinuxLinux4.4.274 <= 4.4.*unaffected
LinuxLinux4.9.274 <= 4.9.*unaffected
LinuxLinux4.14.238 <= 4.14.*unaffected
LinuxLinux4.19.196 <= 4.19.*unaffected
LinuxLinux5.4.128 <= 5.4.*unaffected
LinuxLinux5.10.46 <= 5.10.*unaffected
LinuxLinux5.12.13 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References