CVE-2024-56756
nvme-pci: fix freeing of the HMB descriptor table
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- 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
References (10)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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