---
id: CVE-2020-25639
title: >-
  A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau
  driver functionality in versions prior to 5.12-rc1 in the way the user calls
  ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC
summary: >-
  A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau
  driver functionality in versions prior to 5.12-rc1 in the way the user calls
  ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to crash
  the sy…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: redhat
product: openshift_container_platform
affected:
  - linux_kernel <= 5.11.2
  - fedora = 32
  - fedora = 33
  - openshift_container_platform = 4.4
  - openshift_container_platform = 4.5
  - openshift_container_platform = 4.6
  - enterprise_linux = 5.0
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - messaging_realtime_grid = 2.0
published: '2021-03-04'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:17:26.640'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25639'
references:
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1876995'
    label: secalert@redhat.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HE4CT3NL6OEBRRBUKHIX63GLNVOWCVRW/
    label: secalert@redhat.com
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SUCBCKRHWP3UD2AVVYQJE7BIJEMCMXW5/
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=1876995'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HE4CT3NL6OEBRRBUKHIX63GLNVOWCVRW/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SUCBCKRHWP3UD2AVVYQJE7BIJEMCMXW5/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-25639.json
  - url: 'https://access.redhat.com/security/cve/CVE-2020-25639'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2020-25639'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2020-25639'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00366
epssPercentile: 0.30266
ingestedAt: '2026-10-08T22:11:53.726Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T21:00:16.850188Z'
---

## Overview

A NULL pointer dereference flaw was found in the Linux kernel's GPU Nouveau driver functionality in versions prior to 5.12-rc1 in the way the user calls ioctl DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC. This flaw allows a local user to crash the system.

## Affected

- `linux_kernel <= 5.11.2`
- `fedora = 32`
- `fedora = 33`
- `openshift_container_platform = 4.4`
- `openshift_container_platform = 4.5`
- `openshift_container_platform = 4.6`
- `enterprise_linux = 5.0`
- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `messaging_realtime_grid = 2.0`

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 8 · no fix planned: Red Hat Enterprise Linux 8 · updated 2026-10-08 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-25639.json)