Improper initialization in Linux kernel - CVE-2026-90021
Published: September 16, 2026
Vulnerability identifier: #VU150258
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90021
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a kernel warning.
The vulnerability exists due to improper initialization of a work structure in f_midi_alloc() when freeing a MIDI gadget function that was not bound. A local user can free an unbound MIDI gadget function to cause a kernel warning.
The warning occurs in __flush_work because the work function pointer is null.
Affected software
Linux kernel
How to mitigate CVE-2026-90021
Install security update from vendor's repository.