CVE-2026-72467

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.