---
id: CVE-2026-89502
title: 'ring-buffer: Free cpu_buffer::free_page with subbuf_order'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ring-buffer: Free cpu_buffer::free_page with subbuf_order

  When sub-buffers use an order greater than 0, cpu_buffer->free_page is
  allocated with subbuf_order. Use the c…
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-763
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b <
    77275ccea06eaf297e8e6ac3fc830cb72086379a
  - >-
    Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b <
    8c1ecdcdea738efe0494af908f12c0ae3a97fffa
  - >-
    Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b <
    81063bbb16c4fcf0136c9117d5e49d3621dd6a1e
  - >-
    Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b <
    234b1a72e9706fe20c08c96f4374ec8e83b934cb
  - Linux 6.8
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:47:53.802Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89502'
references:
  - url: 'https://git.kernel.org/stable/c/77275ccea06eaf297e8e6ac3fc830cb72086379a'
  - url: 'https://git.kernel.org/stable/c/8c1ecdcdea738efe0494af908f12c0ae3a97fffa'
  - url: 'https://git.kernel.org/stable/c/81063bbb16c4fcf0136c9117d5e49d3621dd6a1e'
  - url: 'https://git.kernel.org/stable/c/234b1a72e9706fe20c08c96f4374ec8e83b934cb'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89502.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89502'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532342'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89502'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89502'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89502.mbox
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.10483
ingestedAt: '2026-09-14T11:11:19.887Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Free cpu_buffer::free_page with subbuf_order

When sub-buffers use an order greater than 0, cpu_buffer->free_page is
allocated with subbuf_order. Use the correct order for
cpu_buffer->free_page.

## Affected

- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 77275ccea06eaf297e8e6ac3fc830cb72086379a`
- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 8c1ecdcdea738efe0494af908f12c0ae3a97fffa`
- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e`
- `Linux >= f9b94daa542a8d2532f0930f01cd9aec2d19621b < 234b1a72e9706fe20c08c96f4374ec8e83b934cb`
- `Linux 6.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89502.json)