Bug 2334805 (CVE-2024-56756)

Summary: CVE-2024-56756 kernel: nvme-pci: fix freeing of the HMB descriptor table
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2024-12-29 12:01:10 UTC 
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.
Comment 1 Avinash Hanwate 2024-12-30 05:19:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122928-CVE-2024-56756-32fb@gregkh/T