CVE-2020-25656

lowpriority · track · 16EPSS 0.004 · 38 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.44% (38th) EPSS

CVSS 1.9 · low

Is it mine?

50 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

A flaw was found in the Linux kernel. A use-after-free was found in the way the console subsystem was using ioctls KDGKBSENT and KDSKBSENT. A local user could use this flaw to get read memory access out of bounds. The highest threat from this vulnerability is to data confidentiality.

cvss

Technical severity, 0–10. One row per scoring source.

4.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.9–4.1

v2.01.9lowAV:L/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 3.4 · impact 2.9

v3.14.1mediumCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 0.5 · impact 3.6

v3.14.1mediumAV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.13.8lowCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-416USCWE-416US

affected products (50)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Avaya Aura Application Enablement Servicesall versionscert_bundDEcpe:/a:avaya:aura_application_enablement_services:-
Avaya Aura Communication Managerall versionscert_bundDEcpe:/a:avaya:communication_manager:-
Avaya Aura Session Managerall versionscert_bundDEcpe:/a:avaya:session_manager:-
Avaya Aura System Managerall versionscert_bundDEcpe:/a:avaya:aura_system_manager:-
Avaya Web License Managerall versionscert_bundDEcpe:/a:avaya:web_license_manager:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
IBM QRadar SIEMall versionscert_bundDEcpe:/a:ibm:qradar_siem:-
Juniper JUNOSall versionscert_bundDEcpe:/o:juniper:junos:-
Open Source CentOSall versionscert_bundDEcpe:/o:centos:centos:-
Open Source Linux Kernelall versionscert_bundDEcpe:/o:linux:linux_kernel:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
n/a Kernel≤ kernel 5.10-rc2enisa_euvdEU
Novell Inc. OpenSUSE Leap≤ 15.1fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.2fstec_bduRU
Novell Inc. SUSE OpenStack Cloud≤ 9fstec_bduRU
Novell Inc. SUSE OpenStack Cloud≤ 8fstec_bduRU

showing 20 of 50

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-2090Linux Kernel: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2020-10-15csaf · cert_bundDE
Ein entfernter Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um Informationen offenzulegen.
PUB-A-1749047052021-05-01vendor · osvUS
In vt_do_kdgkb_ioctl of keyboard.c, there is a possible use after free read due to a race condition. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv cert_bund NVD CVE.org MITRE

published 2020-12-02modified 2026-06-17

references (41)

External citations — patches, advisories, analysis.

scry

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