CVE-2026-72467 xprtrdma: Check frwr_wp_create() during connect
A null pointer dereference in the Linux kernel's NFS/RDMA client can cause a denial of service if memory region creation fails during connection setup.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72467?
CVE-2026-72467 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: Check frwr_wp_create() during connect
frwr_wp_create() creates the singleton Memory Region used to encode padding for Write chunks whose payload length is not XDR-aligned. Its failure paths return a negative errno and leave ep->re_write_pad_mr set to NULL.
rpcrdma_xprt_connect() currently ignores that return value. If frwr_wp_create() fails after the rest of the connection setup succeeds, xprt_rdma_connect_worker() treats the connection attempt as successful and sets XPRT_CONNECTED. A later NFS/RDMA read with a non-4-byte-aligned receive page length reaches rpcrdma_encode_write_list(), passes the NULL write-pad MR to encode_rdma_segment(), and dereferences it.
This is locally triggerable on an NFS/RDMA client after a connect or reconnect hits a local MR allocation, DMA-map, MR-map, or post-send failure; a remote peer alone cannot force the local MR setup failure.
Check the return value and fail the connect as -ENOTCONN, matching the adjacent setup failures. This keeps XPRT_CONNECTED clear and lets the normal reconnect path retry.
Which versions are affected by CVE-2026-72467?
How do I fix CVE-2026-72467?
Apply the vendor's patch.
Is CVE-2026-72467 being exploited?
There is no known exploitation of CVE-2026-72467 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72467, DEBIAN-CVE-2026-72467, GHSA-4qhc-6r4v-5wmg, UBUNTU-CVE-2026-72467.