SB20260502122 - Improper Initialization in Linux kernel gadget function driver

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Main Vulnerability Database SB20260502122

SB20260502122 - Improper Initialization in Linux kernel gadget function driver

Published: May 2, 2026

Security Bulletin ID SB20260502122
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Initialization (CVE-ID: CVE-2026-31721)

CWE-ID: CWE-665 - Improper Initialization

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 improper initialization of wait queues in f_hid when re-binding the UDC while a previously opened /dev/hidg0 file descriptor remains registered with epoll. A local user can use the file descriptor in epoll operations across unbind and rebind events to cause a denial of service.

The issue is triggered when the same file descriptor is used with EPOLL_CTL_ADD before unbinding and with EPOLL_CTL_DEL after rebinding.


Remediation

Install update from vendor's website.

References