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CVE-2026-46202: Linux

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: HID: appletb-kbd: run inactivity autodim from workqueues The autodim code in hid-appletb-kbd takes backlight_device->ops_lock via backlight_device_set_brightness() -> mutex_lock() from two different atomic contexts: * appletb_inactivity_timer() is a struct timer_list callback, so it runs in softirq context. Every expiry triggers BUG: sleeping function called from invalid context at kernel/locking/mutex.c:591 Call Trace: <IRQ> __might_resched __mutex_lock backlight_device_set_brightness appletb_inactivity_timer call_timer_fn run_timer_softirq * reset_inactivity_timer() is called from appletb_kbd_hid_event() and appletb_kbd_inp_event(). On real USB hardware these run in softirq/IRQ context (URB completion and input-event dispatch). When the Touch Bar has already been dimmed or turned off, the reset path calls backlight_device_set_brightness() directly to restore brightness, producing the same warning. Both call sites hit the same mutex_lock()-from-atomic bug. Fix them together by moving the blocking work onto the system workqueue: * Convert the inactivity timer from struct timer_list to struct delayed_work; the callback (appletb_inactivity_work) now runs in process context where mutex_lock() is legal. * Add a dedicated struct work_struct restore_brightness_work and have reset_inactivity_timer() schedule it instead of calling backlight_device_set_brightness() directly. Cancel both works synchronously during driver tear-down alongside the existing backlight reference drop. The semantics are unchanged (same delays, same state transitions on dim, turn-off and user activity); only the execution context of the sleeping call changes. The timer field and callback are renamed to match their new type; reset_inactivity_timer() keeps its name because it is invoked from input event paths that read naturally as "reset

    Засегнати продукти

    • Linux Linux: 93a0fc48948107e0cc34e1de22c3cb363a8f2783 преди 5c0830323689ef15224f0025276176988861b3b0; 93a0fc48948107e0cc34e1de22c3cb363a8f2783 преди 2473a334c292af257ef68e33bc7760f4a8251812; 93a0fc48948107e0cc34e1de22c3cb363a8f2783 преди 1654e53349d4e657b331de354313461f401f5063
    • Linux Linux: 6.15; преди 6.15; 6.18.32 до 6.18.*; 7.0.9 до 7.0.*; от 7.1 нататък

    История

    • 28 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-46202: Linux | freedomonline.bg