CVE-2024-56756 Information

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.

Reference

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