CVE-2026-97986
UnknownSummary
In the Linux kernel, the virtio_input driver has an ordering issue during device removal. virtinput_remove() unregisters the input device before resetting the virtio device, allowing a callback to use vi->idev after it is freed. The fix resets the device first and rechecks vi->ready after taking the lock.
Risk Assessment
Use-after-free can lead to system crashes or potential privilege escalation. This affects systems with virtio_input, especially on non-PCI/MMIO transports.
Recommendation
Update the Linux kernel to a version containing the fix. Avoid outdated kernels in environments with virtual input devices.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: virtio_input: stop callbacks before unregistering input device virtinput_remove() unregisters the input device before resetting the virtio device. virtinput_recv_events() drops vi->lock around input_event(), so clearing vi->ready does not stop a callback that passed the entry check. It can still use vi->idev, requeue buffers and kick the queue. Reset first, as virtinput_freeze() already does. With the preceding core change, reset waits for callbacks before input_unregister_device() can free vi->idev. Recheck vi->ready after taking the lock again: keep draining completed events so an input packet is not truncated, but stop requeueing buffers and kicking the queue. With evdev attached, input_unregister_handle() currently waits for an RCU grace period, which also waits out IRQ callbacks. This masks the lifetime bug on PCI and MMIO, but does not protect sleepable callbacks on other transports.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS