CVE-2026-89505

Summary

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.

Affected Software

Weaknesses

References

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

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