---
id: CVE-2026-80854
title: >-
  kernel: usb: gadget: f_tcm: keep port count until LUN teardown completes
  (CVE-2026-80854)
summary: >-
  A flaw was found in the Linux kernel's f_tcm USB gadget module. A race
  condition can occur during the teardown of a Logical Unit Number (LUN) when it
  overlaps with a session removal. This timing issue can lead to a
  use-after-free vulnerabi…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-416
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-04'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T02:37:28+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80854.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80854.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-80854'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2528638'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-80854'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80854'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80854.mbox
  - url: 'https://kernelcve.org/list/?q=CVE-2026-80854'
  - url: 'https://git.kernel.org/stable/c/c494c5562ca69b61a82f566e3b87a445d2c28929'
  - url: 'https://git.kernel.org/stable/c/c1f359d9a5efed458946063de65ddbeaacc4f165'
  - url: 'https://git.kernel.org/stable/c/178f59a0bccd3f66cdfa5184310f31a58b7257c4'
  - url: 'https://git.kernel.org/stable/c/ad6f0375d2e93a1d8c015463e5e92dfcb26e311b'
  - url: 'https://git.kernel.org/stable/c/2efbfd42441d3ef8137aff2d59e9835e1d5ae780'
  - url: 'https://git.kernel.org/stable/c/85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95'
  - url: 'https://git.kernel.org/stable/c/bbd6aa311a9f4dd17822c7557451458d3d2e980b'
  - url: 'https://git.kernel.org/stable/c/eaa96a8458f54d6cf0954242ab8b1df2a6fccafa'
  - url: 'https://git.kernel.org/stable/c/c39d0916da47d94909391876c9e5bd429ea7b1b9'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00182
epssPercentile: 0.07703
ingestedAt: '2026-10-19T09:16:01.494Z'
---

## Overview

A flaw was found in the Linux kernel's f_tcm USB gadget module. A race condition can occur during the teardown of a Logical Unit Number (LUN) when it overlaps with a session removal. This timing issue can lead to a use-after-free vulnerability, causing the system to crash and resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80854.json)

**kernel: usb: gadget: f_tcm: keep port count until LUN teardown completes** — rated Moderate by Red Hat. Released 2026-09-04, updated 2026-10-24.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope

Workarounds / mitigations:

- Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.