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CVE-2024-38543

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure The kcalloc() in dmirror_device_evict_chunk() will return null…

Published Jun 19, 2024CWE-476EPSS 0.24%

Overview

CVE-2024-38543 is a medium-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

lib/test_hmm.c: handle src_pfns and dst_pfns allocation failure

The kcalloc() in dmirror_device_evict_chunk() will return null if the

physical memory has run out. As a result, if src_pfns or dst_pfns is

dereferenced, the null pointer dereference bug will happen.

Moreover, the device is going away. If the kcalloc() fails, the pages

mapping a chunk could not be evicted. So add a __GFP_NOFAIL flag in

kcalloc().

Finally, as there is no need to have physically contiguous memory, Switch

kcalloc() to kvcalloc() in order to avoid failing allocations.

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/1a21fdeea502658e315bd939409b755974f4fb64Refgit.kernel.org/stable/c/3b20d18f475bd17309db640dbe7d7c7ebb5bc2bcRefgit.kernel.org/stable/c/65e528a69cb3ed4a286c45b4afba57461c8b5b33Refgit.kernel.org/stable/c/c2af060d1c18beaec56351cf9c9bcbbc5af341a3Refgit.kernel.org/stable/c/ce47e8ead9a72834cc68431d53f8092ce69bebb7Refgit.kernel.org/stable/c/1a21fdeea502658e315bd939409b755974f4fb64Refgit.kernel.org/stable/c/3b20d18f475bd17309db640dbe7d7c7ebb5bc2bcRefgit.kernel.org/stable/c/65e528a69cb3ed4a286c45b4afba57461c8b5b33Refgit.kernel.org/stable/c/c2af060d1c18beaec56351cf9c9bcbbc5af341a3Refgit.kernel.org/stable/c/ce47e8ead9a72834cc68431d53f8092ce69bebb7

How CyberStrike helps

Frequently asked questions

What is CVE-2024-38543?

CVE-2024-38543 is a medium-severity vulnerability. It was published on June 19, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-38543?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-38543?

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-2024-38543?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-38543 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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