---
id: CVE-2026-89748
title: >-
  kernel: tracing: Fix retry exhaustion in simple ring buffer reader swap
  (CVE-2026-89748)
summary: >-
  A flaw was found in the Linux kernel's tracing subsystem. An issue in the
  `simple_ring_buffer_swap_reader_page()` function, related to retry exhaustion
  during ring buffer reader page swaps, can lead to incorrect handling of
  successful or f…
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-787
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:37:05+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89748.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89748.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89748'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532233'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89748'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89748'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89748.mbox
  - url: 'https://git.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268'
  - url: 'https://git.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00165
epssPercentile: 0.05046
scores:
  vendor: 6.1
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.472Z'
---

## Overview

A flaw was found in the Linux kernel's tracing subsystem. An issue in the `simple_ring_buffer_swap_reader_page()` function, related to retry exhaustion during ring buffer reader page swaps, can lead to incorrect handling of successful or failed operations. This can result in corruption of the ring buffer, potentially causing system instability or denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89748.json)

**kernel: tracing: Fix retry exhaustion in simple ring buffer reader swap** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.

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.