CVE-2026-89798
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, rpcrdma_rn_register() inserts @rn into rd_xa via xa_alloc() before storing the caller's callback in rn->rn_done. A device removal racing a fresh registration can observe @rn with rn_done still NULL and call through a NULL function pointer. The fix stores rn->rn_done before xa_alloc() and clears it on allocation failure.
Risk Assessment
A kernel crash (null pointer dereference) may occur during RDMA device removal racing with notification registration. In the failed-registration scenario, an unrelated rd_xa slot may be erased and rd_kref underflowed.
Recommendation
Update the Linux kernel to a version containing the fix for the ordering of rn_done store relative to xa_alloc(). Avoid concurrent RDMA device removal and notification registration until patched.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rpcrdma: arm rn_done before publishing the notification rpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before storing the caller's callback in rn->rn_done. The xarray makes @rn reachable to rpcrdma_remove_one(), which walks rd_xa and invokes rn->rn_done(rn) for every registered notification. A device removal that races a fresh registration can therefore observe @rn with rn_done still NULL, because the notification objects are zero allocated by their owners, and call through a NULL function pointer. Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback. rpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel for a completed registration, so the early store must not survive a failed registration. Clear rn_done again when xa_alloc() fails. Were it left set, the failed-accept cleanup path would call rpcrdma_rn_unregister() on an @rn that was never inserted, erasing an unrelated rd_xa slot and underflowing rd_kref.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS