CVE-2026-90022

7.8 HIGH

Published 2026-09-16 · Updated 2026-09-17

AI risk analysis

Summary: The flaw involves a use-after-free vulnerability in the f_midi2 USB gadget driver, where the string attribute show path can read a freed pointer, leading to potential data corruption or exploitation.
Exploitability: Exploitation requires concurrent write and read operations on the USB gadget, making it moderately difficult. The vulnerability exists only when specific conditions are met.
Blast radius: If exploited, the vulnerability could lead to data corruption or privilege escalation, impacting the stability and security of the system.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to the fixed version 5.19-rc1 or later.

usbuse-after-freekernellow-level

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi2: fix use-after-free in string attribute show path f_midi2_opts_str_show() takes the string lock internally, but its callers dereference the opts->info.<field> pointer before calling it, outside the lock. This races with f_midi2_opts_str_store(), which frees the old string under opts->lock when the attribute is written concurrently, the show path can read a pointer that gets freed before the lock inside str_show() is even taken. Change f_midi2_opts_str_show() to take a pointer to the string field, matching the existing pattern in f_midi2_opts_str_store(), and dereference it only after the lock is held. Update all three callers (iface_name, block name, and the EP string option macro) accordingly.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.