The kernel driver for RDMA devices incorrectly invokes a completion handler when a completion queue is in direct mode. The handler is expected to be absent in this mode, yet it is called during driver reset, producing a WARN_ONCE in the kernel log. This bug does not expose sensitive data or enable arbitrary code execution, but it indicates an incorrect assumption in error handling and may lead to confusion during debugging or rare driver instability during resets.

The issue applies to Linux kernel drivers for RDMA/hns devices. All releases of the Linux kernel that do not incorporate the patch described in the provided commit references are affected; supported vendor versions are not listed in the data.

Exploitability is considered low; the EPSS score is not available and the vulnerability is not listed in CISA KEV. No attack vector or known exploitation pathway is documented, so the primary concern is the warning and potential minor instability during device reset rather than a serious security compromise.