CVE-2020-25656

Name: CVE-2020-25656
Creator: NVD / NIST
Published: 2020-12-02T01:15:12.607+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.1/10EPSS 0.43%

Last modified Jun 17, 2026

CVE-2020-25656 is a medium-severity vulnerability rated 4.1/10 on the CVSS scale. 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. EPSS estimates a 0.43% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

4.1/10

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.43%

34.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	< 5.10	—
Linux	Linux Kernel	5.10	Rc1
Redhat	Enterprise Linux	7.0	—
Redhat	Enterprise Linux	8.0	—
Debian	Debian Linux	9.0	—
Starwindsoftware	Starwind Virtual San	v8	Build12533

References

https://bugzilla.redhat.com/show_bug.cgi?id=1888726Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List, Third Party Advisory
https://lkml.org/lkml/2020/10/16/84Exploit, Mailing List, Third Party Advisory
https://lkml.org/lkml/2020/10/29/528Mailing List, Patch, Third Party Advisory
https://www.starwindsoftware.com/security/sw-20210325-0006/Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1888726Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.htmlMailing List, Third Party Advisory
https://lkml.org/lkml/2020/10/16/84Exploit, Mailing List, Third Party Advisory
https://lkml.org/lkml/2020/10/29/528Mailing List, Patch, Third Party Advisory
https://www.starwindsoftware.com/security/sw-20210325-0006/Third Party Advisory

Timeline

Published: Dec 2, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25656?

How severe is CVE-2020-25656?

CVE-2020-25656 has a CVSS score of 4.1/10 (MEDIUM severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25656?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-25656?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST