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CVE-2021-47467

5.3 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: kunit: fix reference count leak in kfree_at_end The reference counting issue happens in the normal path of kfree_at_end().

Published May 22, 2024EPSS 0.49%

Overview

CVE-2021-47467 is a medium-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

kunit: fix reference count leak in kfree_at_end

The reference counting issue happens in the normal path of

kfree_at_end(). When kunit_alloc_and_get_resource() is invoked, the

function forgets to handle the returned resource object, whose refcount

increased inside, causing a refcount leak.

Fix this issue by calling kunit_alloc_resource() instead of

kunit_alloc_and_get_resource().

Fixed the following when applying:

Shuah Khan <[email protected]>

CHECK: Alignment should match open parenthesis

+ kunit_alloc_resource(test, NULL, kfree_res_free, GFP_KERNEL,

(void *)to_free);

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/bbdd158b40b66a9403391a517f24ef6613573446Refgit.kernel.org/stable/c/f62314b1ced25c58b86e044fc951cd6a1ea234cfRefgit.kernel.org/stable/c/bbdd158b40b66a9403391a517f24ef6613573446Refgit.kernel.org/stable/c/f62314b1ced25c58b86e044fc951cd6a1ea234cf

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47467?

CVE-2021-47467 is a medium-severity vulnerability. It was published on May 22, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2021-47467?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-47467?

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-2021-47467?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47467 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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