---
id: CVE-2026-89500
title: >-
  kernel: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
  (CVE-2026-89500)
summary: >-
  A flaw was found in the Linux kernel's ring-buffer component. When a cached
  reader page is discarded after a concurrent ring buffer resize, the system may
  use an incorrect buffer size for memory deallocation. This mismatch can lead
  to a ke…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-763
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T08:13:16+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89500.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89500.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89500'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532513'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89500'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89500'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89500.mbox
  - url: 'https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c'
  - url: 'https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7'
  - url: 'https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00173
epssPercentile: 0.05952
scores:
  vendor: 4.1
  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 cached reader page is discarded after a concurrent ring buffer resize, the system may use an incorrect buffer size for memory deallocation. This mismatch can lead to a kernel crash, resulting in a Denial of Service (DoS), or it could cause memory leaks, potentially leading to information disclosure.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89500.json)

**kernel: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- Red Hat Enterprise Linux 10

No fix planned:

- Red Hat Enterprise Linux 10

Not affected:

- 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

Affected