CVE-2026-31722

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_rndis: Fix net_device lifecycle with device_move The net_device is allocated during function instance creation and registered during the bind phase with the gadget device as its sysfs parent. When the function unbinds, the parent device is destroyed, but the net_device survives, resulting in dangling sysfs symlinks: console:/ # ls -l /sys/class/net/usb0 lrwxrwxrwx ... /sys/class/net/usb0 -> /sys/devices/platform/.../gadget.0/net/usb0 console:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0 ls: .../gadget.0/net/usb0: No such file or directory Use device_move() to reparent the net_device between the gadget device tree and /sys/devices/virtual across bind and unbind cycles. During the final unbind, calling device_move(NULL) moves the net_device to the virtual device tree before the gadget device is destroyed. On rebinding, device_move() reparents the device back under the new gadget, ensuring proper sysfs topology and power management ordering. To maintain compatibility with legacy composite drivers (e.g., multi.c), the borrowed_net flag is used to indicate whether the network device is shared and pre-registered during the legacy driver's bind phase.

• https://git.kernel.org/stable/c/18ada801899f2b13ef0ceff42427ad980a41e619Patch
• https://git.kernel.org/stable/c/1ef251aa63972fe6c0f107f5abd139b7d0f7987aPatch
• https://git.kernel.org/stable/c/6045ea5ca6e3fa13f8a9fafb1c535c86e124c14dPatch
• https://git.kernel.org/stable/c/e367599529dc42578545a7f85fde517b35b3cda7Patch

Published

May 1, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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