---
id: CVE-2026-89646
title: >-
  kernel: ceph: fix leaked inode reference on writeback abort at umount
  (CVE-2026-89646)
summary: >-
  A flaw was found in the Ceph filesystem component of the Linux kernel. When a
  writeback operation is aborted during an unmount process, a reference to an
  inode (a data structure describing a filesystem object) is not properly
  released. Thi…
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-911
vendor: Red Hat
product: Red Hat Enterprise Linux 10
affected:
  - enterprise_linux 10
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T08:12:17+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89646'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532514'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89646'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89646'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89646.mbox
  - url: 'https://git.kernel.org/stable/c/ac7a5a5385762df458d10cccc086a4e079be7409'
  - url: 'https://git.kernel.org/stable/c/c25aee9c630fb86f98d79eccb75765067079b972'
  - url: 'https://git.kernel.org/stable/c/ec32015a955c5d326c5e26610edfdcccd52f2314'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00173
epssPercentile: 0.07061
scores:
  vendor: 4.4
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Ceph filesystem component of the Linux kernel. When a writeback operation is aborted during an unmount process, a reference to an inode (a data structure describing a filesystem object) is not properly released. This prevents the inode from being evicted, potentially leading to a kernel bug and a denial of service (DoS) condition, where the system becomes unresponsive or crashes.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89646.json)

**kernel: ceph: fix leaked inode reference on writeback abort at umount** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-15.

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

Fix deferred