CVE-2026-93154 RDMA/irdma: Add refcounting to user ring MRs
A missing reference count in the Linux kernel's irdma RDMA driver allows userspace to trigger a use-after-free, potentially leading to privilege escalation or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93154?
CVE-2026-93154 is a high-severity use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-93154?
How do I fix CVE-2026-93154?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-93154 being exploited?
There is no known exploitation of CVE-2026-93154 in the wild and no public exploit code.
Sources
Also known as AZL-102752, BELL-CVE-2026-93154, DEBIAN-CVE-2026-93154, GHSA-wq95-frfx-7w32, UBUNTU-CVE-2026-93154.