medium 4.4

CVE-2020-25639 json

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 t…

published 2021-03-04 5y ago modified 2026-10-08 last mo. also EUVD-2020-18306

cvss: 4.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits: 0; none known

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.

Patch / fix

distros 6

debian ubuntu suse opensuse azure linux arch linux

linux Debian 14, Debian 13, Debian 12 5.10.19-1

debian advisories DEBIAN-CVE-2020-25639

linux Ubuntu 20.04 LTS 5.4.0-73.82
linux-aws Ubuntu 20.04 LTS 5.4.0-1048.50
linux-gcp Ubuntu 20.04 LTS 5.4.0-1043.46
linux-gke Ubuntu 20.04 LTS 5.4.0-1043.45
linux-kvm Ubuntu 20.04 LTS 5.4.0-1039.40
linux-azure Ubuntu 20.04 LTS 5.4.0-1047.49
linux-gkeop Ubuntu 20.04 LTS 5.4.0-1015.16
linux-raspi Ubuntu 20.04 LTS 5.4.0-1035.38

ubuntu advisories UBUNTU-CVE-2020-25639

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

kernel-syms SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 4.12.14-197.83.1
kernel-source SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 4.12.14-197.83.1
kernel-default SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +8 more 4.12.14-197.83.1
kernel-zfcpdump SLES 15 SP1-LTSS, Manager Server 4.0 4.12.14-197.83.1
kernel-obs-build SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 4.12.14-197.83.1
kernel-syms SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.66.1
kernel-source SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +1 more 4.12.14-150.66.1
kernel-default SLES for SAP 15, SLES 15-LTSS, SLE Live Patching 15 +3 more 4.12.14-150.66.1

suse advisories SUSE-SU-2021:0532-1 SUSE-SU-2021:0438-1 SUSE-SU-2021:0434-1 SUSE-SU-2021:0433-1 SUSE-SU-2021:0427-1 SUSE-SU-2021:0354-1

kernel-source openSUSE Tumbleweed 5.14.6-1.4
kernel-source openSUSE Tumbleweed 6.6.17-1.1
kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.91.1
kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.91.1
kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.91.1
kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.91.1
kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.91.1
kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.91.1

opensuse advisories openSUSE-SU-2024:10728-1 openSUSE-SU-2024:13704-1 openSUSE-SU-2021:0075-1 openSUSE-SU-2021:0060-1

kernel CBL-Mariner 2.0 5.10.78.1-1

azure linux advisories AZL-6523

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

linux Arch Linux 5.11.3.arch1-1
linux-hardened Arch Linux 5.10.21.hardened1-1
linux-zen Arch Linux 5.11.3.zen1-1
linux-lts Arch Linux 5.10.20-1

arch linux advisories AVG-1644 AVG-1645 AVG-1646 AVG-1647

Is CVE-2020-25639 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25639 updated 2026-11-06 cvss 4.4

kernel: NULL pointer dereference via nouveau ioctl can lead to DoS

Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
affected: workaround, no fix available “Fix deferred”
Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: last mo. (2026-10-08)

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=1876995 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.4	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.9	AV:L/AC:L/Au:N/C:N/I:N/A:C

Affected products

n/a kernel

Classification

Weakness

CWE-476 NULL Pointer Dereference

Technology feeds

Linux kernel rss critical rss

References

bugzilla.redhat.com /show_bug.cgi?id=1876995
exploit, issue-tracking, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/HE4CT3NL6OEBRRBUKHIX63GLNVOWCVRW/
vendor-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/SUCBCKRHWP3UD2AVVYQJE7BIJEMCMXW5/
vendor-advisory

Sources

CVE List CVE-2020-25639
NVD CVE-2020-25639

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

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