CVE-2026-89534svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails

Official description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Clear sc_cm_id when ADDR_CHANGE replacement fails When svc_rdma_listen_handler() handles RDMA_CM_EVENT_ADDR_CHANGE, it creates a replacement listener cm_id and returns 1, telling the CM core to destroy the old one. If the replacement allocation fails, sc_cm_id still points at the old cm_id that the CM core is about to destroy. Any subsequent dereference of sc_cm_id -- such as svc_rdma_detach()'s rdma_disconnect() call -- is a use-after-free. NULL sc_cm_id on the failure path and guard svc_rdma_detach()'s rdma_disconnect() call against NULL so that the listener can be torn down safely when the server shuts down.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/2a68aeb2de8ad0fef9c50e73a50622a35c6af1a8
• https://git.kernel.org/stable/c/65f0f82f20334e76acaf29087a59af7b3b9699ed
• https://git.kernel.org/stable/c/673e358ab7c11f8cec223c6a36a793056a67facd
• https://git.kernel.org/stable/c/01500306e1d50de7ca7a2cdcdfa28ac0523eb747