---
id: CVE-2026-93056
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: gadget: f_uac1_legacy: remove broken string configfs attributes

  The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for
  the fn_play, fn_cap, and fn_…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  usb: gadget: f_uac1_legacy: remove broken string configfs attributes

  The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for
  the fn_play, fn_cap, and fn_…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    745adfe6c337f3d5d7737d57529d14a208151b45
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    6351ba62778f72dc4f6bc18bfa99e618829cff0d
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    021b58ac3e58cffa68ed9585ff492a19e98414f6
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    8b9335aec93975bb9186d63993a5a610e5066ffc
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    2ed25c9d4400cf90d9201657963a231c27a5ea57
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    977659adb341f6e30fb00dcf183f63f29df879e2
  - >-
    Linux >= 0854611a19ae4dfa56569e6f640017a1d2dd3312 <
    590d74ec8f488e06b9f1c0f8f0941f45531f3a55
  - Linux 3.18
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:59.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93056'
references:
  - url: 'https://git.kernel.org/stable/c/021b58ac3e58cffa68ed9585ff492a19e98414f6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2ed25c9d4400cf90d9201657963a231c27a5ea57'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/590d74ec8f488e06b9f1c0f8f0941f45531f3a55'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6351ba62778f72dc4f6bc18bfa99e618829cff0d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/745adfe6c337f3d5d7737d57529d14a208151b45'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8b9335aec93975bb9186d63993a5a610e5066ffc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/977659adb341f6e30fb00dcf183f63f29df879e2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fd43eae7d539ea7cfc7c9f0d3f0eaa890415e8a7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93056.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-93056'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2536811'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-93056'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93056'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93056.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-17T16:21:47.769Z'
epss: 0.0022
epssPercentile: 0.11057
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-476
---

## Overview

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

usb: gadget: f_uac1_legacy: remove broken string configfs attributes

The UAC1_STR_ATTRIBUTE macro defines configfs show/store handlers for
the fn_play, fn_cap, and fn_cntl string options. The store function
contains an inverted null check on the kstrndup() return value.

This means every write attempt returns -ENOMEM on success and
dereferences a NULL pointer on allocation failure. The attributes
have been broken and unused for many years.

Remove the UAC1_STR_ATTRIBUTE macro and the three attributes it
generated. The internal defaults (FILE_PCM_PLAYBACK, FILE_PCM_CAPTURE,
FILE_CONTROL) set in f_audio_alloc_inst() are unaffected.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93056.json)