CVE-2025-68282

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> usb: gadget: udc: fix use-after-free in usb_gadget_state_work<br /> <br /> A race condition during gadget teardown can lead to a use-after-free<br /> in usb_gadget_state_work(), as reported by KASAN:<br /> <br /> BUG: KASAN: invalid-access in sysfs_notify+0x2c/0xd0<br /> Workqueue: events usb_gadget_state_work<br /> <br /> The fundamental race occurs because a concurrent event (e.g., an<br /> interrupt) can call usb_gadget_set_state() and schedule gadget-&gt;work<br /> at any time during the cleanup process in usb_del_gadget().<br /> <br /> Commit 399a45e5237c ("usb: gadget: core: flush gadget workqueue after<br /> device removal") attempted to fix this by moving flush_work() to after<br /> device_del(). However, this does not fully solve the race, as a new<br /> work item can still be scheduled *after* flush_work() completes but<br /> before the gadget&amp;#39;s memory is freed, leading to the same use-after-free.<br /> <br /> This patch fixes the race condition robustly by introducing a &amp;#39;teardown&amp;#39;<br /> flag and a &amp;#39;state_lock&amp;#39; spinlock to the usb_gadget struct. The flag is<br /> set during cleanup in usb_del_gadget() *before* calling flush_work() to<br /> prevent any new work from being scheduled once cleanup has commenced.<br /> The scheduling site, usb_gadget_set_state(), now checks this flag under<br /> the lock before queueing the work, thus safely closing the race window.