---
id: CVE-2026-89716
title: 'zram: validate deflate params'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  zram: validate deflate params

  We must validate user-supplied deflate winbits before we pass it to
  zlib_deflate_workspacesize(), which triggers BUG_ON() if winbits valu…
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: Linux
product: Linux
affected:
  - >-
    Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 <
    923578d0f0d0703c3db61ab35dc37075ae53b0bd
  - >-
    Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 <
    e23fac4ab2a5728386477b98a402a1042b21bffb
  - >-
    Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 <
    ec7607ac4717ff521c9c1e9d8271c26293345513
  - Linux 6.16
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:51:29.156Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89716'
references:
  - url: 'https://git.kernel.org/stable/c/923578d0f0d0703c3db61ab35dc37075ae53b0bd'
  - url: 'https://git.kernel.org/stable/c/e23fac4ab2a5728386477b98a402a1042b21bffb'
  - url: 'https://git.kernel.org/stable/c/ec7607ac4717ff521c9c1e9d8271c26293345513'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.10638
ingestedAt: '2026-09-14T11:11:19.885Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

zram: validate deflate params

We must validate user-supplied deflate winbits before we pass it to
zlib_deflate_workspacesize(), which triggers BUG_ON() if winbits value is
outside of valid ranges.

## Affected

- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < 923578d0f0d0703c3db61ab35dc37075ae53b0bd`
- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < e23fac4ab2a5728386477b98a402a1042b21bffb`
- `Linux >= dc75a0d93bd5a1c64104efb4ec680463afbdd755 < ec7607ac4717ff521c9c1e9d8271c26293345513`
- `Linux 6.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)