medium
4.1
CWE
416
Advisory Published
CVE Published
CVE Published
Updated

CVE-2020-25656: Use After Free

First published: Thu Oct 15 2020(Updated: )

A flaw was found in Linux Kernel, where a race in KDGKBSENT and KDSKBSENT leads to use-after-free read in vt_do_kdgkb_ioctl References: <a href="https://groups.google.com/g/syzkaller-bugs/c/kZsmxkpq3UI/m/J35PFexWBgAJ?pli=1">https://groups.google.com/g/syzkaller-bugs/c/kZsmxkpq3UI/m/J35PFexWBgAJ?pli=1</a>

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:3.10.0-1160.21.1.rt56.1158.el7
0:3.10.0-1160.21.1.rt56.1158.el7
redhat/kernel<0:3.10.0-1160.21.1.el7
0:3.10.0-1160.21.1.el7
redhat/kernel<5.10
5.10
Linux Kernel<5.10
Linux Kernel=5.10-rc1
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
Debian GNU/Linux=9.0
StarWind Virtual SAN=v8-build12533
StarWind Virtual SAN=v8-build12658
StarWind Virtual SAN=v8-build12859
StarWind Virtual SAN=v8-build13170
StarWind Virtual SAN=v8-build13586
StarWind Virtual SAN=v8-build13861
debian/linux
5.10.223-1
5.10.226-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.13-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=1888726

Remedy

https://lkml.org/lkml/2020/10/29/528

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2020-25656?

    CVE-2020-25656 has a medium severity rating due to the potential for a use-after-free vulnerability in the Linux Kernel.

  • How do I fix CVE-2020-25656?

    To fix CVE-2020-25656, update your Linux Kernel to the recommended versions, such as 5.10 or apply specific patches provided by your distribution.

  • Which systems are affected by CVE-2020-25656?

    CVE-2020-25656 affects various versions of the Linux Kernel, particularly those in Red Hat Enterprise Linux 7, 8, and Debian 9.0, among others.

  • What is the exploitability of CVE-2020-25656?

    CVE-2020-25656 is considered exploitable under specific conditions where a race condition may lead to unauthorized memory access.

  • Are there any known mitigations for CVE-2020-25656?

    Currently, the primary mitigation for CVE-2020-25656 is to ensure that relevant software is updated to patched versions that address the vulnerability.

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