SB20260502123 - 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-2026-31722)

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_rndis net_device lifecycle handling when unbinding and rebinding 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/18ada801899f2b13ef0ceff42427ad980a41e619
• https://git.kernel.org/stable/c/1ef251aa63972fe6c0f107f5abd139b7d0f7987a
• https://git.kernel.org/stable/c/6045ea5ca6e3fa13f8a9fafb1c535c86e124c14d
• https://git.kernel.org/stable/c/e367599529dc42578545a7f85fde517b35b3cda7