---
id: CVE-2026-89716
title: 'kernel: zram: validate deflate params (CVE-2026-89716)'
summary: >-
  A flaw was found in the zram component of the Linux kernel. This vulnerability
  occurs because the system does not properly validate user-supplied deflate
  parameters, specifically `winbits` values. An attacker could exploit this by
  providin…
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-617
vendor: Red Hat
product: Red Hat OpenShift Container Platform 4
affected:
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:22:04+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89716'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532456'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89716'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89716'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89716.mbox
  - url: 'https://git.kernel.org/stable/c/923578d0f0d0703c3db61ab35dc37075ae53b0bd'
  - url: 'https://git.kernel.org/stable/c/e23fac4ab2a5728386477b98a402a1042b21bffb'
  - url: 'https://git.kernel.org/stable/c/ec7607ac4717ff521c9c1e9d8271c26293345513'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00206
epssPercentile: 0.09441
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

A flaw was found in the zram component of the Linux kernel. This vulnerability occurs because the system does not properly validate user-supplied deflate parameters, specifically `winbits` values. An attacker could exploit this by providing malformed input, which would trigger an internal error (`BUG_ON()`) and lead to a system crash, resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89716.json)

**kernel: zram: validate deflate params** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-21.

Affected:

- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred