Overview
About vulnerability
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.
Details
- Affected product:
- AlmaLinux 9.2 ESU , Debian 10 ELS , Debian 11 ELS , TuxCare 9.6 ESU , TuxCare 9.8 ESU
- Affected packages:
- linux @ 4.19.0 (+4 more)