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CVE-2021-47361

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(car…

Published May 21, 2024CWE-416EPSS 0.24%

Overview

CVE-2021-47361 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:

mcb: fix error handling in mcb_alloc_bus()

There are two bugs:

1) If ida_simple_get() fails then this code calls put_device(carrier)

but we haven't yet called get_device(carrier) and probably that

leads to a use after free.

2) After device_initialize() then we need to use put_device() to

release the bus. This will free the internal resources tied to the

device and call mcb_free_bus() which will free the rest.

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/115b07d9f47e3996430b8f2007edd9768e1f807fRefgit.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbaeRefgit.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6bRefgit.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0Refgit.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aeaRefgit.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0Refgit.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499Refgit.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807fRefgit.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbaeRefgit.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47361?

CVE-2021-47361 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-2021-47361?

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-2021-47361?

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-2021-47361?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47361 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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