---
id: CVE-2026-89648
title: >-
  kernel: ceph: cap delegated inode count in ceph_parse_deleg_inos()
  (CVE-2026-89648)
summary: >-
  A flaw was found in the Linux kernel's Ceph client. A malicious or compromised
  Ceph Metadata Server (MDS) could send a specially crafted reply with an
  unbounded number of delegated inode intervals. This could cause the client to
  enter an i…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-606
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: '2026-09-14'
sourceUpdated: '2026-09-14T16:47:08+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89648'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532046'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89648'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89648'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89648.mbox
  - url: 'https://git.kernel.org/stable/c/4bd3158bd62466d57ed72a3f7bc5f205fedd6919'
  - url: 'https://git.kernel.org/stable/c/c040e139f1a629b767f900bbbc3f9892c290ed85'
  - url: 'https://git.kernel.org/stable/c/f341270ac5f5077804d7837ce77b0f0df1cea29d'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00609
epssPercentile: 0.47854
scores:
  vendor: 5.9
  cna: 7.5
ingestedAt: '2026-09-14T15:23:07.473Z'
---

## Overview

A flaw was found in the Linux kernel's Ceph client. A malicious or compromised Ceph Metadata Server (MDS) could send a specially crafted reply with an unbounded number of delegated inode intervals. This could cause the client to enter an infinite loop or exhaust memory resources, leading to a denial of service (DoS) for the client system.

## Vendor advisories

- **Red Hat VEX** · Moderate · 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 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89648.json)

**kernel: ceph: cap delegated inode count in ceph_parse_deleg_inos()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

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

Affected