Linux kernel (drivers/infiniband/core): Bursts of network neighbour updates crash the node. Each event re-initializes a

Impact

Bursts of network neighbour updates crash the node. Each event re-initializes a work item that is already queued for the same connection id, corrupting the kernel workqueue and faulting in the worker thread - a whole-host outage triggered by traffic conditions rather than by anything the operator does.

Who can reach it

Reachable from the fabric/IP network with no host credentials: a peer that provokes back-to-back neighbour (ARP/ND) updates for an address that has a live rdma_cm connection id - route churn, address flapping, or a deliberately noisy neighbour on the same segment. Any RDMA provider using rdma_cm is affected, hardware or soft-RoCE.

What to do

No fixed release is listed in this record - apply the referenced stable fix commits or run a current stable kernel (the follow-up fix for the same code is in 6.1.142 / 6.6.94 / 6.12.34 / 6.15, so land both). Interim: none reliable, since the trigger is ordinary network event handling.

References