---
id: CVE-2026-89770
title: >-
  kernel: iomap: don't free integrity payload that doesn't exist
  (CVE-2026-89770)
summary: >-
  A flaw was found in the `iomap` component of the Linux kernel. This
  vulnerability occurs when Protection Information (PI) verification is disabled
  on a block device, causing `fs_bio_integrity_alloc` to not allocate a bio
  integrity payload.…
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-476
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:06:07+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89770.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89770.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89770'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532471'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89770'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89770'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89770.mbox
  - url: 'https://git.kernel.org/stable/c/65651f1001aa3638909bc58c7b2b46160692757b'
  - url: 'https://git.kernel.org/stable/c/8a8685b32c0718cc7b2cb4d6202e5a5b8e0a8e2d'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00145
epssPercentile: 0.04162
ingestedAt: '2026-09-14T11:11:19.884Z'
---

## Overview

A flaw was found in the `iomap` component of the Linux kernel. This vulnerability occurs when Protection Information (PI) verification is disabled on a block device, causing `fs_bio_integrity_alloc` to not allocate a bio integrity payload. Subsequently, the `iomap_bio_read_folio_range_sync` function attempts to free this non-existent payload, leading to a NULL pointer dereference. This could potentially result in a system crash or denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89770.json)

**kernel: iomap: don't free integrity payload that doesn't exist** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred