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CVE-2026-98286: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: drop_monitor: use timer_shutdown_sync() to prevent timer rearming during teardown In drop_monitor teardown paths (net_dm_trace_off_set(), net_dm_hw_monitor_stop(), and error unwind paths in net_dm_trace_on_set() and net_dm_hw_monitor_start()), per-CPU timers are stopped using timer_delete_sync() followed by cancel_work_sync(). However, there is a circular dependency between send_timer and dm_alert_work: 1) sched_send_work() (timer callback) schedules dm_alert_work. 2) send_dm_alert() / net_dm_hw_summary_work() calls reset_per_cpu_data() or net_dm_hw_reset_per_cpu_data(). 3) If memory allocation fails under memory pressure in the reset function, it re-arms the timer via mod_timer(&data->send_timer, ...). If dm_alert_work is running concurrently while timer_delete_sync() executes on another CPU, an allocation failure in the worker will re-arm the timer after timer_delete_sync() has already returned. Once cancel_work_sync() completes and module_put() is called, the timer remains active in the timer wheel. If the module is then unloaded, the timer will fire and execute sched_send_work() in freed memory, triggering a kernel panic / use-after-free. Switch from timer_delete_sync() to timer_shutdown_sync(). This guarantees that any in-flight timer handler has finished and prevents subsequent re-arming attempts from running workers from succeeding. When monitoring is restarted later, timer_setup() is invoked, which cleanly re-initializes the timer.

    Засегнати продукти

    • Linux Linux: 9398e9c0b1d44eeb700e9e766c02bcc765c82570 преди 9616b0c67fbd8cc0b49de7b26cdf2ab33747c80e; 9398e9c0b1d44eeb700e9e766c02bcc765c82570 преди bda4d9525fb91a2388ee09669421b8d505290864; 9398e9c0b1d44eeb700e9e766c02bcc765c82570 преди c391a40f71886b28c082b47270f0e856fa3e1150; 2514c7ad115e762562c7bdd58bb1ab3425a98245; 439b1164da3612ec7e186e1dc314471e7190bfc7; 5.10.27 преди 5.11; 5.11.11 преди 5.12
    • Linux Linux: 5.12; преди 5.12; 6.18.54 до 6.18.*; 7.2.8 до 7.2.*; от 7.3 нататък

    История

    • 6 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-98286: Linux | freedomonline.bg