CVE-2026-93154: RDMA/irdma: Add refcounting to user ring MRs
Published Sep 17, 2026
·Updated
In the Linux kernel, the following vulnerability has been resolved:
RDMA/irdma: Add refcounting to user ring MRs
Prevent userspace from deregistering the MRs that back QP/CQ/SRQ rings by bumping the MR's refcount upon association.
Affected Software
1 affected component
Linux Linux kernel
Event History
Sep 17, 2026
CVE Published
via MITRE·04:11 PM
Data Sourced
via MITRE·04:11 PM
Description
Frequently Asked Questions
1
Who is exposed to this issue?
Systems using the Linux kernel irdma RDMA driver and userspace queue pair, completion queue, or shared receive queue rings backed by memory regions are exposed.
2
What is required to trigger the issue?
A userspace process must be able to associate memory regions with QP, CQ, or SRQ rings and then attempt to deregister those backing memory regions.
3
What does the fix change?
The fix increments the memory region reference count when it is associated with a user ring, preventing userspace from deregistering the memory region while the ring still depends on it.