---
id: CVE-2026-74634
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ring-buffer: Prevent subbuf order change when resizing is disabled

  Because ring_buffer_subbuf_order_set() frees buffer pages, we can't
  allow it when resizing is disabl…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ring-buffer: Prevent subbuf order change when resizing is disabled

  Because ring_buffer_subbuf_order_set() frees buffer pages, we can't
  allow it when resizing is disabl…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74634'
references:
  - url: 'https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00125
epssPercentile: 0.01971
ingestedAt: '2026-10-14T13:30:58.522Z'
---

## Overview

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

ring-buffer: Prevent subbuf order change when resizing is disabled

Because ring_buffer_subbuf_order_set() frees buffer pages, we can't
allow it when resizing is disabled. A non-consuming reader is at risk of
use-after-free (rb_advance_iter()).

Return -EBUSY on resize_disabled, matching ring_buffer_resize()
behaviour.

## Remediation

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