CVE-2026-72468xprtrdma: Initialize re_id before removal registration

Official description

In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Initialize re_id before removal registration rpcrdma_create_id() registers ep->re_rn with the rpcrdma ib_client before returning the new rdma_cm_id to rpcrdma_ep_create(). However rpcrdma_ep_create() currently stores that pointer in ep->re_id only after rpcrdma_create_id() returns. A local administrator can race an NFS/RDMA mount against RDMA device removal. If rpcrdma_remove_one() observes the just-registered notification before rpcrdma_ep_create() assigns ep->re_id, rpcrdma_ep_removal_done() calls trace_xprtrdma_device_removal(NULL). The tracepoint dereferences id->device->name and copies id->route.addr.dst_addr, so the callback can crash the kernel with a NULL pointer dereference. Store the rdma_cm_id in ep->re_id immediately before publishing ep->re_rn. The existing error path still destroys the id directly if registration fails; ep is then freed by the caller without using ep->re_id. Remove the later duplicate assignment in rpcrdma_ep_create().

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/51248d877bbc6e604e38aeaf776c2781cb4f0dbd
• https://git.kernel.org/stable/c/28743571c17b58c21a7216fc9faaf8028df5869b
• https://git.kernel.org/stable/c/264ccd7871915749bee55fe0c39467a7f08d5479
• https://git.kernel.org/stable/c/bb7caa63e1db22fd03e8dc591b12169e99169dff