CVE-2026-31727 PUBLISHED

usb: gadget: u_ether: Fix NULL pointer deref in eth_get_drvinfo

Assigner: Linux
Reserved: 09.03.2026 Published: 01.05.2026 Updated: 01.05.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 93f116c3393a22acab96ad1bef12b2572eb80ca4 to 0326429e8ba99892e1d1e115dc8e88e1a3b64e24 (excl.)
  • affected from e584cb58a2ea7ff4d3a4bc43d5ca512ed3ecb77d to a36e5e800b9c93e3e1ffa42f34d38b36775dbcee (excl.)
  • affected from 85acaba2f42b557499bab3608307f17bf13beb69 to 7de4d46be40738c7e48e64b5cc0a34aa1e047b0a (excl.)
  • affected from ec35c1969650e7cb6c8a91020e568ed46e3551b0 to e002e92e88e12457373ed096b18716d97e7bbb20 (excl.)
Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 6.12.78 to 6.12.81 (excl.)
  • affected from 6.18.19 to 6.18.22 (excl.)
  • affected from 6.19.9 to 6.19.12 (excl.)

References