usb: gadget: f_subset: Fix net_device lifecycle with device_move
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.
CVE-2026-31723
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31723
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8cedba7c73af1369599b1111639cfeb66fe13aaa",
"lessThan": "edb08047051883591517feb5a51bf2bfd2b769fb",
"versionType": "git"
},
{
"status": "affected",
"version": "8cedba7c73af1369599b1111639cfeb66fe13aaa",
"lessThan": "70707ce668494c4d35fe070dfbc7cc541b293107",
"versionType": "git"
},
{
"status": "affected",
"version": "8cedba7c73af1369599b1111639cfeb66fe13aaa",
"lessThan": "9cbc4f109bb216623894d8819fb930210ed34b21",
"versionType": "git"
},
{
"status": "affected",
"version": "8cedba7c73af1369599b1111639cfeb66fe13aaa",
"lessThan": "fde29916e4cc736c4ca6c78f331e12b2c73ccafd",
"versionType": "git"
},
{
"status": "affected",
"version": "8cedba7c73af1369599b1111639cfeb66fe13aaa",
"lessThan": "06524cd1c9011bee141a87e43ab878641ed3652b",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_subset.c",
"drivers/usb/gadget/function/u_gether.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_subset.c",
"drivers/usb/gadget/function/u_gether.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31723
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46240 · Revision 1
- Added to Heist Feed
- Publisher date