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CVE-2026-80771: HID: nintendo: register input device after capabilities are set

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: HID: nintendo: register input device after capabilities are set input_register_device() exposes the device to userspace immediately. In joycon_input_create() it was called before joycon_config_rumble() configures the FF_RUMBLE capability and the memless force-feedback device, so a concurrent EVIOCSFF could dereference a NULL dev->ff. Registering early also means the initial udev event lacks button and axis information, which can make input managers ignore the device. Move input_register_device() to the end of joycon_input_create(), after all capabilities, the IMU input device and the force-feedback callbacks have been configured.

Affected products

• Linux: 5.16 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/268679f501386ad46405d42c2bcf89384cb5e256
• https://git.kernel.org/stable/c/27dc4b8eadac73b3c3cc526c8547d8b4ae8528be
• https://git.kernel.org/stable/c/3288bec1a21d582b504344380139cdc0e88ebe4d
• https://git.kernel.org/stable/c/a2a46a705c1fa724aac158fd188273dd7ee8c171
• https://git.kernel.org/stable/c/a9fc7547f911ada09da33c5e204e5acda38e765a
• https://git.kernel.org/stable/c/d723bc1fe2e72b9252234e94c11af644ec477bf7

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