---
id: CVE-2026-98772
title: 'kernel: USB: serial: fix port tear down use-after-free (CVE-2026-98772)'
summary: >-
  A flaw was found in the Linux kernel's USB serial subsystem. This flaw may
  result in a Denial of Service (DoS) due to a use-after-free vulnerability.
  During multiport device disconnection, a race condition allows background
  completion hand…
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-825
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: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T08:07:15+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98772'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555149'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98772'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98772'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98772.mbox
  - url: 'https://git.kernel.org/stable/c/e4a6883ad9b4686a5f4bd90ff55a44d7ab65bd3c'
  - url: 'https://git.kernel.org/stable/c/60cc9379c3e650d1ebfba4de63f1242537a62a32'
  - url: 'https://git.kernel.org/stable/c/5e8980a81af195c49084be5b4c031085b56c7443'
  - url: 'https://git.kernel.org/stable/c/e80ee74206f260eb1282e7d1339ff146a4a410d0'
  - url: 'https://git.kernel.org/stable/c/33c920f7c5952dfc42d1b8ea6efe16b1f0bb0c5b'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00168
epssPercentile: 0.05977
ingestedAt: '2026-10-18T16:47:32.492Z'
---

## Overview

A flaw was found in the Linux kernel's USB serial subsystem. This flaw may result in a Denial of Service (DoS) due to a use-after-free vulnerability. During multiport device disconnection, a race condition allows background completion handlers to access port driver data after it has already been freed. A local user or an attacker with physical access could exploit this timing issue during device teardown to trigger a system crash.

## 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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98772.json)

**kernel: USB: serial: fix port tear down use-after-free** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

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