---
id: CVE-2026-93121
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths

  The error paths for endpoint-disabled (ESHUTDOWN) and request-allocation
  failure (ENOMEM) in …
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths

  The error paths for endpoint-disabled (ESHUTDOWN) and request-allocation
  failure (ENOMEM) in …
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 <
    be539138d9a187af3b884525a395db10797c64f1
  - >-
    Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 <
    5fd8baacc7dc477df9cac61b45491840247a9b1e
  - >-
    Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 <
    58952c83dfe6ea3294a74734d2d1018c1120779a
  - >-
    Linux >= 7b07a2a7ca02a20124b552be96c5a56910795488 <
    621707dc67c9846fd876d7579ec951d92aa033f1
  - Linux 6.9
published: '2026-09-17'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:18:21.560'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93121'
references:
  - url: 'https://git.kernel.org/stable/c/58952c83dfe6ea3294a74734d2d1018c1120779a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5fd8baacc7dc477df9cac61b45491840247a9b1e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/621707dc67c9846fd876d7579ec951d92aa033f1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/be539138d9a187af3b884525a395db10797c64f1'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00155
epssPercentile: 0.03876
ingestedAt: '2026-09-17T16:21:47.751Z'
---

## Overview

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

usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths

The error paths for endpoint-disabled (ESHUTDOWN) and request-allocation
failure (ENOMEM) in ffs_dmabuf_transfer() jump to err_fence_put which
calls dma_fence_put() on the fence. However, at that point the fence has
only been kmalloc'd — dma_fence_init() has not been called yet, so the
refcount and the fence ops are uninitialized. Calling dma_fence_put() on
such an object leads to undefined behavior.

Use kfree() instead, since the fence is just a plain allocation at this
stage, and rename the label to err_fence_free to reflect the actual
cleanup action.

## Remediation

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