CVE-2026-89732

A flaw was found in the Linux kernel's USB FunctionFS ffs module. A local attacker could exploit a deadlock vulnerability in the ffsep0read function. This occurs when a userspace daemon polls ep0 and the USB gadget is simultaneously torn down, causing the kernel to enter an unresponsive state. Th...

CVE-2026-89732

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: ffs: Prevent deadlock during ep0 read loop Currently, ffsep0read holds ffs-mutex when it prepares to go to sleep waiting for an event. When no setup events are pending, it calls waiteventinterruptibleexclusivelockedi...

CVE-2026-89732

CVE-2026-89732 is a deadlock in the Linux kernel 's USB gadget f_fs (function filesystem) subsystem. The root cause is that ffs_ep0_read() holds ffs->mutex while calling wait_event_interruptible_exclusive_locked_irq(), which sleeps without releasing the mutex. When a userspace daemon is pollin...