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CVE-2024-56756

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix freeing of the HMB descriptor table The HMB descriptor table is sized to the maximum number of descriptors that c…

Published Dec 29, 2024EPSS 0.22%

Overview

CVE-2024-56756 is a medium-severity vulnerability. It was published on December 29, 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:

nvme-pci: fix freeing of the HMB descriptor table

The HMB descriptor table is sized to the maximum number of descriptors

that could be used for a given device, but __nvme_alloc_host_mem could

break out of the loop earlier on memory allocation failure and end up

using less descriptors than planned for, which leads to an incorrect

size passed to dma_free_coherent.

In practice this was not showing up because the number of descriptors

tends to be low and the dma coherent allocator always allocates and

frees at least a page.

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/3c2fb1ca8086eb139b2a551358137525ae8e0d7aRefgit.kernel.org/stable/c/452f9ddd12bebc04cef741e8ba3806bf0e1fd015Refgit.kernel.org/stable/c/582d9ed999b004fb1d415ecbfa86d4d8df455269Refgit.kernel.org/stable/c/6d0f599db73b099aa724a12736369c4d4d92849dRefgit.kernel.org/stable/c/869cf50b9c9d1059f5223f79ef68fc0bc6210095Refgit.kernel.org/stable/c/ac22240540e0c5230d8c4138e3778420b712716aRefgit.kernel.org/stable/c/cee3bff51a35cab1c5d842d409a7b11caefe2386Refgit.kernel.org/stable/c/fb96d5cfa97a7363245b3dd523f475b04296d87bReflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.html

How CyberStrike helps

Frequently asked questions

What is CVE-2024-56756?

CVE-2024-56756 is a medium-severity vulnerability. It was published on December 29, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56756?

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-2024-56756?

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-2024-56756?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-56756 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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