---
id: CVE-2026-89559
title: >-
  kernel: libnvdimm/labels: Prevent integer overflow in __nd_label_validate()
  (CVE-2026-89559)
summary: >-
  A flaw was found in the Linux kernel's `libnvdimm/labels` component. An
  integer overflow vulnerability exists in the `__nd_label_validate()` function,
  where a 32-bit calculation of a namespace index field (`nslot`) can wrap
  around. This al…
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-787
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: '2026-09-15'
sourceUpdated: '2026-09-15T16:23:30+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89559'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532126'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89559'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89559'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89559.mbox
  - url: 'https://git.kernel.org/stable/c/b4975f2ff6c82adc24ae547f029f82530ba43cfe'
  - url: 'https://git.kernel.org/stable/c/6030597ec683d1e5b46445f888bb5c7776b5a0c4'
  - url: 'https://git.kernel.org/stable/c/1c391696d2791f82ae462e11da9a0d96f90b240c'
  - url: 'https://git.kernel.org/stable/c/93967bfb17dab66642c57e609c99e1a91fe11278'
  - url: 'https://git.kernel.org/stable/c/e057efcc9c71d90099d9ee00bed0748d0e9fd586'
  - url: 'https://git.kernel.org/stable/c/09e649117c54b7e1c004f22eaa19efbadd9ac856'
  - url: 'https://git.kernel.org/stable/c/69a734359639fca16a0dd73ab17a34943e76c68b'
  - url: 'https://git.kernel.org/stable/c/037770686126155eafc44501312989e2837b9659'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00164
epssPercentile: 0.06023
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

A flaw was found in the Linux kernel's `libnvdimm/labels` component. An integer overflow vulnerability exists in the `__nd_label_validate()` function, where a 32-bit calculation of a namespace index field (`nslot`) can wrap around. This allows a local attacker, or an attacker with control over the storage medium, to provide a specially crafted `nslot` value. This crafted value can bypass security checks, leading to an out-of-bounds write and potential memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · 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 OpenShift Container Platform 4, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89559.json)

**kernel: libnvdimm/labels: Prevent integer overflow in __nd_label_validate()** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

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

Not affected:

- Red Hat Enterprise Linux 6

## Remediation

Fix deferred