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CVE-2021-47520

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe.

Published May 24, 2024CWE-416EPSS 0.34%

Overview

CVE-2021-47520 is a high-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

can: pch_can: pch_can_rx_normal: fix use after free

After calling netif_receive_skb(skb), dereferencing skb is unsafe.

Especially, the can_frame cf which aliases skb memory is dereferenced

just after the call netif_receive_skb(skb).

Reordering the lines solves the issue.

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/3a3c46e2eff0577454860a203be1a8295f4acb76Refgit.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aaRefgit.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7Refgit.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612eRefgit.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458dbRefgit.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4Refgit.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3Refgit.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8dRefgit.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76Refgit.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47520?

CVE-2021-47520 is a high-severity vulnerability. It was published on May 24, 2024 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-47520?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47520?

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-2021-47520?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47520 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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