A memory leak in the sdma_init() function in drivers/infiniband/hw/hfi1/sdma.c in the Linux kernel before 5.3.9 allows attackers to cause a denial of service (memory consumption) by triggering rhashtable_init() failures.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1775001]
This was fixed for Fedora with the 5.3.9 stable kernel update.
This issue is rated as having Low impact because of the preconditions needed to trigger the resource cleanup code path (system-wide out-of-memory condition).
In order to mitigate this issue it is possible to prevent the affected code from being loaded by blacklisting the kernel module hfi1. For instructions relating to how to blacklist a kernel module refer to: https://access.redhat.com/solutions/41278 .