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CVE-2021-47235

7.8 · HIGH

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) { ...

Published May 21, 2024CWE-416EPSS 0.23%

Overview

CVE-2021-47235 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2Refgit.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84aRefgit.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6Refgit.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7eaRefgit.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6Refgit.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bbRefgit.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130Refgit.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8Refgit.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2Refgit.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47235?

CVE-2021-47235 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47235?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47235?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47235?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47235 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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