usb: gadget: f_subset: Fix net_device lifecycle with device_move
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.81, 6.18.22, 6.19.12
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_subset: 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 bound flag is used to indicate whether the network device is shared and pre-registered during the legacy driver's bind phase.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 8cedba7c73af1369599b1111639cfeb66fe13aaa · fixed in edb08047051883591517feb5a51bf2bfd2b769fb; From 8cedba7c73af1369599b1111639cfeb66fe13aaa · fixed in 70707ce668494c4d35fe070dfbc7cc541b293107; From 8cedba7c73af1369599b1111639cfeb66fe13aaa · fixed in 9cbc4f109bb216623894d8819fb930210ed34b21; From 8cedba7c73af1369599b1111639cfeb66fe13aaa · fixed in fde29916e4cc736c4ca6c78f331e12b2c73ccafd; From 8cedba7c73af1369599b1111639cfeb66fe13aaa · fixed in 06524cd1c9011bee141a87e43ab878641ed3652b
- Linux Linux
3.11
- KernelLinux
From 3.11.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.81; From 6.13.0 · fixed in 6.18.22; From 6.19.0 · fixed in 6.19.12