---
id: CVE-2026-89652
title: >-
  kernel: ceph: bound copied dentry name length in NFS export get_name
  (CVE-2026-89652)
summary: >-
  A flaw was found in the Linux kernel's Ceph file system. A malicious or
  compromised Ceph Metadata Server (MDS) can send a specially crafted
  `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names
  during an NFS export ope…
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-120
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T17:47:40+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89652'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532101'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89652'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89652'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89652.mbox
  - url: 'https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011'
  - url: 'https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a'
  - url: 'https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec'
  - url: 'https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6'
  - url: 'https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00463
epssPercentile: 0.39252
scores:
  vendor: 7
  cna: 9.8
ingestedAt: '2026-09-14T15:23:07.450Z'
---

## Overview

A flaw was found in the Linux kernel's Ceph file system. A malicious or compromised Ceph Metadata Server (MDS) can send a specially crafted `LOOKUPNAME` reply that causes a buffer overflow when copying dentry names during an NFS export operation. This out-of-bounds write can lead to memory corruption on the client system, particularly when a CephFS mount is re-exported over NFS.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, 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 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89652.json)

**kernel: ceph: bound copied dentry name length in NFS export get_name** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- 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 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Affected