---
id: CVE-2026-90023
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  usb: gadget: f_mass_storage: fix null pointer dereference in
  fsg_common_set_num_buffers()


  Previously fsg_num_buffers_validate() was removed as it was not

  necessary due…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  usb: gadget: f_mass_storage: fix null pointer dereference in
  fsg_common_set_num_buffers()


  Previously fsg_num_buffers_validate() was removed as it was not

  necessary due…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fe5a6c48fd954489f51aab151d5dad9254c76419 <
    9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957
  - >-
    Linux >= fe5a6c48fd954489f51aab151d5dad9254c76419 <
    b9b5b5df5b8dd3c1572ed267200276a44cc67d8e
  - >-
    Linux >= fe5a6c48fd954489f51aab151d5dad9254c76419 <
    2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc
  - Linux 4.8
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T11:17:15.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90023'
references:
  - url: 'https://git.kernel.org/stable/c/2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9e8dd2a7a8ccbb756771ad985b0ad3387ed3c957'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b9b5b5df5b8dd3c1572ed267200276a44cc67d8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.936Z'
epss: 0.00219
epssPercentile: 0.10948
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers()

Previously fsg_num_buffers_validate() was removed as it was not
necessary due to Kconfig setting the limits for n from 2 to 256 with
default as 2. However, setting the page content in such a way that
kstrtou8() reflects n value as either 0 or 1 bypasses these
restrictions leading to a null pointer dereference if n is 0. Fix
this by adding a check for n < 2 and returning -EINVAL if n is
either 0 or 1 consistent with Kconfig logic.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.