CVE-2026-72467
Low risk· EPSS 11%Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, the xprtrdma module has a vulnerability where the return value of frwr_wp_create() is ignored during connection setup. If the function fails, ep->re_write_pad_mr remains NULL, and the connection is still considered successful, leading to NULL pointer dereference when encoding the write list. The fix checks the return value and fails the connection with -ENOTCONN.
Risk Assessment
The vulnerability can lead to a kernel crash (NULL pointer dereference) due to a failed MR allocation, which can be triggered locally and lead to system unavailability.
Recommendation
Apply the kernel patch that checks the result of frwr_wp_create() and fails the connection accordingly. Update the system to a kernel version with the fix.
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Original NVD description (English source)
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.