---
id: CVE-2026-89499
title: >-
  kernel: ring-buffer: Stop remote reader update when page swap fails
  (CVE-2026-89499)
summary: >-
  A flaw was found in the Linux kernel's ring-buffer component. When a remote
  reader update fails during a page swap, the system incorrectly proceeds as if
  the swap succeeded. This can lead to log flooding, potentially causing a
  denial of se…
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-390
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T05:46:52+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89499.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89499.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89499'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532499'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89499'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89499'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89499.mbox
  - url: 'https://git.kernel.org/stable/c/5eab74874d11160725c42ab676ba97a797a362eb'
  - url: 'https://git.kernel.org/stable/c/a14a97048e48471e283d76879b83d2ae323e0722'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0012
epssPercentile: 0.02113
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.475Z'
---

## Overview

A flaw was found in the Linux kernel's ring-buffer component. When a remote reader update fails during a page swap, the system incorrectly proceeds as if the swap succeeded. This can lead to log flooding, potentially causing a denial of service by exhausting system resources or hindering system diagnostics.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89499.json)

**kernel: ring-buffer: Stop remote reader update when page swap fails** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

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.