CVE-2024-56756: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.13 — 5.4.287
linux	linux_kernel	5.5 — 5.10.231
linux	linux_kernel	5.11 — 5.15.174
linux	linux_kernel	5.16 — 6.1.120
linux	linux_kernel	6.2 — 6.6.64
linux	linux_kernel	6.7 — 6.11.11
linux	linux_kernel	6.12 — 6.12.2

References

Advisories & Patches

https://git.kernel.org/stable/c/3c2fb1ca8086eb139b2a551358137525ae8e0d7a https://git.kernel.org/stable/c/452f9ddd12bebc04cef741e8ba3806bf0e1fd015 https://git.kernel.org/stable/c/582d9ed999b004fb1d415ecbfa86d4d8df455269 https://git.kernel.org/stable/c/6d0f599db73b099aa724a12736369c4d4d92849d https://git.kernel.org/stable/c/869cf50b9c9d1059f5223f79ef68fc0bc6210095 https://git.kernel.org/stable/c/ac22240540e0c5230d8c4138e3778420b712716a https://git.kernel.org/stable/c/cee3bff51a35cab1c5d842d409a7b11caefe2386 https://git.kernel.org/stable/c/fb96d5cfa97a7363245b3dd523f475b04296d87b

Other References

https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-56756? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-56756? +

CVE-2024-56756 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-56756? +

CVE-2024-56756 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-56756? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-56756