CVE-2024-56756: nvme-pci: fix freeing of the HMB descriptor table
First published: Sun Dec 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=4.13<5.4.287 | |
| Linux Kernel | >=5.5<5.10.231 | |
| Linux Kernel | >=5.11<5.15.174 | |
| Linux Kernel | >=5.16<6.1.120 | |
| Linux Kernel | >=6.2<6.6.64 | |
| Linux Kernel | >=6.7<6.11.11 | |
| Linux Kernel | >=6.12<6.12.2 | |
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/ac22240540e0c5230d8c4138e3778420b712716a
- https://git.kernel.org/stable/c/452f9ddd12bebc04cef741e8ba3806bf0e1fd015
- https://git.kernel.org/stable/c/869cf50b9c9d1059f5223f79ef68fc0bc6210095
- https://git.kernel.org/stable/c/fb96d5cfa97a7363245b3dd523f475b04296d87b
- https://git.kernel.org/stable/c/cee3bff51a35cab1c5d842d409a7b11caefe2386
- https://git.kernel.org/stable/c/6d0f599db73b099aa724a12736369c4d4d92849d
- https://git.kernel.org/stable/c/582d9ed999b004fb1d415ecbfa86d4d8df455269
- https://git.kernel.org/stable/c/3c2fb1ca8086eb139b2a551358137525ae8e0d7a
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56756
- https://nvd.nist.gov/vuln/detail/CVE-2024-56756
- https://launchpad.net/bugs/cve/CVE-2024-56756
- https://security-tracker.debian.org/tracker/CVE-2024-56756
- https://ubuntu.com/security/CVE-2024-56756
- https://git.kernel.org/linus/3c2fb1ca8086eb139b2a551358137525ae8e0d7a
Frequently Asked Questions
What is the severity of CVE-2024-56756?
CVE-2024-56756 has a moderate severity level due to potential impacts on memory management in the Linux kernel.
How do I fix CVE-2024-56756?
To fix CVE-2024-56756, upgrade your Linux kernel to a version that addresses this vulnerability.
What versions of the Linux kernel are affected by CVE-2024-56756?
CVE-2024-56756 affects Linux kernel versions from 4.13 up to 6.12.2.
Is CVE-2024-56756 a local or remote attack vulnerability?
CVE-2024-56756 is primarily a local attack vulnerability, impacting users with access to the system.
What components of the Linux kernel are impacted by CVE-2024-56756?
CVE-2024-56756 specifically impacts the nvme-pci component related to host memory buffer management.
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