CVE-2026-31727 Details
Description
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix NULL pointer deref in eth_get_drvinfo Commit ec35c1969650 ("usb: gadget: f_ncm: Fix net_device lifecycle with device_move") reparents the gadget device to /sys/devices/virtual during unbind, clearing the gadget pointer. If the userspace tool queries on the surviving interface during this detached window, this leads to a NULL pointer dereference. Unable to handle kernel NULL pointer dereference Call trace: eth_get_drvinfo+0x50/0x90 ethtool_get_drvinfo+0x5c/0x1f0 __dev_ethtool+0xaec/0x1fe0 dev_ethtool+0x134/0x2e0 dev_ioctl+0x338/0x560 Add a NULL check for dev->gadget in eth_get_drvinfo(). When detached, skip copying the fw_version and bus_info strings, which is natively handled by ethtool_get_drvinfo for empty strings.
A NULL pointer dereference vulnerability has been identified in the Linux kernel's USB gadget Ethernet function, specifically in the u_ether.c file. This issue arises in versions of the Linux kernel prior to the latest stable release. The vulnerability is triggered when the net_device lifecycle is improperly managed during device unbinding, particularly with the USB Communication Device Class (CDC) Network Control Model) gadget. When the gadget device is detached, the pointer to the gadget is cleared, creating a window where a userspace tool can query the interface and cause a NULL pointer dereference. This flaw has been addressed by adding a NULL check for the gadget pointer in the eth_get_drvinfo function, ensuring that the firmware version and bus information are not copied when the device is detached.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for upgrading the kernel can be found in the documentation for the specific Linux distribution in use.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12.78, < 6.12.81 >= 6.18.19, < 6.18.22 >= 6.19.9, < 6.19.12 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 7.0 rc5 7.0 rc6 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 19, 2026 | CVE Modified | kernel.org |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 7, 2026 | Initial Analysis | [email protected] |
| May 1, 2026 | New CVE Received | kernel.org |