SB20260502124 - Improper control of a resource through its lifetime in Linux kernel gadget function driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-31723)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/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 improper resource management in the f_subset usb gadget network device handling when unbinding the gadget function. A local user can trigger bind and unbind cycles to cause a denial of service.

The issue results in dangling sysfs symlinks because the net_device survives after its parent gadget device is destroyed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/06524cd1c9011bee141a87e43ab878641ed3652b
• https://git.kernel.org/stable/c/70707ce668494c4d35fe070dfbc7cc541b293107
• https://git.kernel.org/stable/c/9cbc4f109bb216623894d8819fb930210ed34b21
• https://git.kernel.org/stable/c/fde29916e4cc736c4ca6c78f331e12b2c73ccafd