CVE-2026-80559

Summary

In the Linux kernel, the following vulnerability has been resolved:

Input: sur40 - fix input device registration ordering

In sur40_probe(), input_register_device() was previously called early before the V4L2 video device and vb2_queue components were fully initialized. If userspace opened the input device immediately upon registration, sur40_open() would trigger and start the sur40_poll() worker thread. This worker thread invokes sur40_process_video() and accesses the uninitialized vb2_queue structure, leading to a data race and potential system crash.

Furthermore, if V4L2 or video registration failed after input_register_device() succeeded, the error path fell through to calling input_free_device() on a successfully registered device instead of input_unregister_device(), corrupting input core state.

Move input_register_device() to the very end of sur40_probe(). This ensures the V4L2 and video queue structures are fully initialized before polling can start, and naturally resolves the error path bug since input_free_device() is now only called when input registration has not yet occurred.

To maintain strict LIFO (Last-In, First-Out) teardown ordering, also move input_unregister_device() to the very beginning of sur40_disconnect(). This guarantees that the input polling worker thread is stopped before V4L2 video components or control handlers are unregistered.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/cd4ecce2fd87760c0ad9a9d28c9fc62ea1dbfd3d
• https://git.kernel.org/stable/c/dab741c9da72102a37cc1020a929051b7c45f9fb
• https://git.kernel.org/stable/c/764b507be7b51787e1f577ca3bf0bab7efe81ff8
• https://git.kernel.org/stable/c/3e8ed76a4f3572e637653f0654cccdf617903231
• https://git.kernel.org/stable/c/83aa12f9f2468a4fbef027c09224dc1011850fb0
• https://git.kernel.org/stable/c/5c1c5227c93f18cd329dd754b4df5e0e2daece1e
• https://git.kernel.org/stable/c/beb9b0bd6e6e23f5e9e42b7ef890a50f57f1f3aa
• https://git.kernel.org/stable/c/9da976eb649c9e2f588a4499410e4d8af687925f

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