---
id: CVE-2026-89501
title: >-
  kernel: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf
  (CVE-2026-89501)
summary: >-
  A flaw was found in the Linux kernel's ring-buffer component. A race condition
  occurs when resizing a sub-buffer without properly holding the
  `cpu_buffer::lock`. This oversight can lead to concurrency issues with memory
  allocation and deal…
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-413
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T21:28:45+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89501'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532254'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89501'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89501'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89501.mbox
  - url: 'https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d'
  - url: 'https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2'
  - url: 'https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2'
  - url: 'https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00175
epssPercentile: 0.06178
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.475Z'
---

## Overview

A flaw was found in the Linux kernel's ring-buffer component. A race condition occurs when resizing a sub-buffer without properly holding the `cpu_buffer::lock`. This oversight can lead to concurrency issues with memory allocation and deallocation operations, potentially resulting in system instability or a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89501.json)

**kernel: ring-buffer: Hold cpu_buffer::lock when resizing a subbuf** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

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