---
id: CVE-2026-89519
title: >-
  kernel: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return
  (CVE-2026-89519)
summary: >-
  A flaw was found in the Linux kernel's `sched_ext` component. Due to a logical
  error where a stale flag (`SCX_RQ_BAL_KEEP`) could be consumed, the scheduler
  might incorrectly keep a task running even after it has been dequeued. This
  could …
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-367
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T04:58:57+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89519'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532339'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89519'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89519'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89519.mbox
  - url: 'https://git.kernel.org/stable/c/6f1d3bfe54430f8d54e0530a27f2ecbf8466576e'
  - url: 'https://git.kernel.org/stable/c/ffaab58d217581cb75353168f8812a16e10463fc'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.08443
ingestedAt: '2026-09-14T11:11:19.886Z'
---

## Overview

A flaw was found in the Linux kernel's `sched_ext` component. Due to a logical error where a stale flag (`SCX_RQ_BAL_KEEP`) could be consumed, the scheduler might incorrectly keep a task running even after it has been dequeued. This could lead to unexpected task management behavior within the kernel.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89519.json)

**kernel: sched_ext: Replace SCX_RQ_BAL_KEEP with a dispatch verdict return** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-16.

Not 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

## Remediation

Refer to the advisory for fix availability.