---
id: CVE-2026-98751
title: 'kernel: tty: abort break signalling on hangup (CVE-2026-98751)'
summary: >-
  A flaw was found in the Linux kernel's terminal (tty) subsystem. A race
  condition can occur when a terminal hangup interrupts an active break
  signaling operation, causing the kernel to communicate with a device driver
  after the device has …
severity: medium
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-366
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T03:39:50+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98751.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98751.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98751'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555161'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98751'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98751'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98751.mbox
  - url: 'https://git.kernel.org/stable/c/6c9c9367351a461d62e5c0a39bffdcfbb40f068b'
  - url: 'https://git.kernel.org/stable/c/3bc82999fb85cecc7eb6ec1755ee7d698aa1e783'
  - url: 'https://git.kernel.org/stable/c/94af6cd832e9b4ce39a8fb59144a8f09ab56fd35'
  - url: 'https://git.kernel.org/stable/c/c8ccd3b2013daaf77b98f8a6724fcf4d2c5c52d6'
  - url: 'https://git.kernel.org/stable/c/845a2737e0f5ffe5ca8d38de556012b0c9472cdd'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00168
epssPercentile: 0.05984
ingestedAt: '2026-10-18T16:47:32.499Z'
---

## Overview

A flaw was found in the Linux kernel's terminal (tty) subsystem. A race condition can occur when a terminal hangup interrupts an active break signaling operation, causing the kernel to communicate with a device driver after the device has already disconnected or powered down. A local attacker could exploit this vulnerability by issuing break commands during a terminal hangup to trigger a system crash, resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: 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 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98751.json)

**kernel: tty: abort break signalling on hangup** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

- 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

No fix planned:

- 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

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Fix deferred