---
id: CVE-2026-89600
title: 'kernel: fanotify: fix use-after-free of file range info (CVE-2026-89600)'
summary: >-
  A flaw was found in the Linux kernel's fanotify subsystem. This use-after-free
  vulnerability occurs when the system attempts to report file range information
  after the memory holding that information has been released. A local attacker
  cou…
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-825
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:32:35+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89600'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532299'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89600'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89600'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89600.mbox
  - url: 'https://git.kernel.org/stable/c/66aa9a9e6481bfa512ee5b6380eaaec455a954d2'
  - url: 'https://git.kernel.org/stable/c/b8f73b163b646bc56d4dce9c697a578e333f4894'
  - url: 'https://git.kernel.org/stable/c/d7f1cf5be33ef0175a4e8ed8687aeb98fb00a851'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00124
epssPercentile: 0.02431
scores:
  vendor: 5.3
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.474Z'
---

## Overview

A flaw was found in the Linux kernel's fanotify subsystem. This use-after-free vulnerability occurs when the system attempts to report file range information after the memory holding that information has been released. A local attacker could potentially exploit this to read stale stack memory, leading to information disclosure or system instability.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89600.json)

**kernel: fanotify: fix use-after-free of file range info** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

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.