---
id: CVE-2026-89647
title: >-
  kernel: ceph: do not repeat ceph_trim_dentries() if no progress possible
  (CVE-2026-89647)
summary: >-
  A flaw was found in the Linux kernel's Ceph file system. The
  `ceph_trim_dentries()` function, when invoked by `ceph_cap_reclaim_work()`,
  can enter an infinite loop under specific conditions where no leases need to
  be reclaimed. This busy l…
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-835
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T16:54:26+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89647'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532249'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89647'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89647'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89647.mbox
  - url: 'https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695'
  - url: 'https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415'
  - url: 'https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93'
  - url: 'https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.0063
epssPercentile: 0.48836
scores:
  vendor: 4.7
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's Ceph file system. The `ceph_trim_dentries()` function, when invoked by `ceph_cap_reclaim_work()`, can enter an infinite loop under specific conditions where no leases need to be reclaimed. This busy loop causes excessive CPU utilization, potentially leading to a Denial of Service (DoS) for affected systems.

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89647.json)

**kernel: ceph: do not repeat ceph_trim_dentries() if no progress possible** — rated Low by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7

## Remediation

Fix deferred