CVE-2026-89732

kernel: usb: gadget: f_fs: Prevent deadlock during ep0 read loop

Loading…

Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 11, 2026

Updated · September 29, 2026

Description

A flaw was found in the Linux kernel's USB FunctionFS (f_fs) module. A local attacker could exploit a deadlock vulnerability in the ffs_ep0_read() function. This occurs when a userspace daemon polls ep0 and the USB gadget is simultaneously torn down, causing the kernel to enter an unresponsive state. This can lead to a denial of service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-833 · Deadlock