CVE-2026-98352RDMA/rtrs-clt: Fix CQ pool leak when connect is interrupted

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-clt: Fix CQ pool leak when connect is interrupted The client borrows shared CQ credits in the ADDR_RESOLVED handler via ib_cq_pool_get(), before the peer is connected. create_cm() can return -ERESTARTSYS from wait_event_interruptible_timeout() without destroying the CM ID. The init_conns() and stop-and-destroy paths then call destroy_con_cq_qp() while cq is still NULL (no PUT) and only afterwards rdma_destroy_id(). CMA serializes the handler against rdma_destroy_id() with handler_mutex, but that does not order the GET against destroy_con_cq_qp(). If ADDR_RESOLVED has already passed the DESTROYING check, it can take con_mutex, GET credits, and then lose the con to kfree. Device unregister later hits WARN_ON(cq->cqe_used) in ib_cq_pool_cleanup(). Set a per-connection flag under con_mutex before CQ/QP teardown so a racing ADDR_RESOLVED cannot borrow credits after teardown has begun.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/a82cca40139d9fcae8208901856bd5bb4051f097
• https://git.kernel.org/stable/c/74c4ed55e61f1b65ddbebc5b635d136461a1c3da
• https://git.kernel.org/stable/c/6f8020fe7465f49e234a576c04e415e9d08c7878
• https://git.kernel.org/stable/c/31024e158b45358370a0a14ed96589e6aa62d6cb
• https://git.kernel.org/stable/c/8f253d5893f991742464b9e7203c43fc08d0aa11
• https://git.kernel.org/stable/c/bf88ac4867050112a6c819c8d1a7209bf48ef427
• https://git.kernel.org/stable/c/2ae16aaa78b5edc6e6d0904c84fd9cdfb762bcda