CVE-2026-72468 xprtrdma: Initialize re_id before removal registration
A local administrator can trigger a kernel crash via a race condition in NFS/RDMA device removal, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72468?
CVE-2026-72468 is a vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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().
Which versions are affected by CVE-2026-72468?
How do I fix CVE-2026-72468?
Apply the vendor's patch.
Is CVE-2026-72468 being exploited?
There is no known exploitation of CVE-2026-72468 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72468, DEBIAN-CVE-2026-72468, GHSA-5xgh-rmhf-2qq8, UBUNTU-CVE-2026-72468.