CVE-2026-68419

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Prevent rereg_mr for non-mem regions

When a QP/CQ/SRQ is created, a two step process is used

where the buffer is allocated in userspace and explicitly

registered with the normal reg_mr mechanism prior to creating

the actual QP/CQ/SRQ object.

These special registrations are indicated via an ABI field

so the driver knows that they do not have a valid mkey and

to skip the actual CQP command submission.

Since these are real MR objects from the core's perspective,

it is possible for a user application to invoke rereg_mr on them

and cause a real CQP op to be emitted with the zero-initialized

mkey value of 0.

Fix this by preventing rereg_mr on these special regions.