What’s Vulnerable › Vulnerabilities
CVE-2020-25656
- Severity: medium (CVSS 4.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2020-12-02 · updated 2026-06-17
- Weakness: CWE-416
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.
Affected products
- Debian Linux: 9.0
- Linux kernel: before 5.10; 5.10-rc1 — fixed in 5.10
- Red Hat Enterprise Linux: 7.0, 8.0
- Starwindsoftware Starwind Virtual San: v8-build12533, v8-build12658, v8-build12859, v8-build13170, v8-build13586, v8-build13861
How to fix
Upgrade to a fixed version: Linux kernel 5.10. Check the vendor advisory for mitigations.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1888726
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- https://lkml.org/lkml/2020/10/16/84
- https://lkml.org/lkml/2020/10/29/528
- https://www.starwindsoftware.com/security/sw-20210325-0006/
- https://bugzilla.redhat.com/show_bug.cgi?id=1888726
- https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- https://lkml.org/lkml/2020/10/16/84
- https://lkml.org/lkml/2020/10/29/528
- https://www.starwindsoftware.com/security/sw-20210325-0006/
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