CVE-2026-89505

In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Guard legacy bundles without method_elm The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer. Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.

• https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487
• https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3

Published

Sep 11, 2026

Last Modified

Sep 11, 2026

Status

Received

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