CVE-2026-31727

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/f9f987472f4b8ab177be2b6492a59278ed969479
• https://git.kernel.org/stable/c/7fce959e9be3bf63bb0fdf4b05f9cc42cb289fe2
• https://git.kernel.org/stable/c/0326429e8ba99892e1d1e115dc8e88e1a3b64e24
• https://git.kernel.org/stable/c/a36e5e800b9c93e3e1ffa42f34d38b36775dbcee
• https://git.kernel.org/stable/c/7de4d46be40738c7e48e64b5cc0a34aa1e047b0a
• https://git.kernel.org/stable/c/e002e92e88e12457373ed096b18716d97e7bbb20

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