SB20260502114 - NULL pointer dereference in Linux kernel gadget function driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-31727)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a NULL pointer dereference in eth_get_drvinfo in the u_ether USB gadget component when handling ethtool queries on a surviving interface during the detached window after unbind. A local user can query the interface with ethtool to cause a denial of service.

The issue occurs after the gadget device has been detached and its gadget pointer has been cleared.

Remediation

Install update from vendor's website.

References

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