CVE-2020-8648: Use After Free

Published Jan 30, 2020
·
Updated

A use-after-free flaw was found in the Linux kernel console driver when using the copy-paste buffer. This flaw allows a local user to crash the system.

Other sources

There is a use-after-free vulnerability in the Linux kernel in the nttyreceivebufcommon function in drivers/tty/ntty.c.

Reference: https://bugzilla.kernel.org/showbug.cgi?id=206361

— Red Hat

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the nttyreceivebufcommon function in drivers/tty/ntty.c.

Affected Software

20 affected componentsFixes available
redhat/kernel-rt<0:3.10.0-1160.31.1.rt56.1169.el7
0:3.10.0-1160.31.1.rt56.1169.el7
redhat/kernel<0:3.10.0-1160.31.1.el7
0:3.10.0-1160.31.1.el7
redhat/kernel<0:3.10.0-957.80.1.el7
0:3.10.0-957.80.1.el7
redhat/kernel<0:3.10.0-1062.56.1.el7
0:3.10.0-1062.56.1.el7
redhat/kernel-rt<0:4.18.0-240.rt7.54.el8
0:4.18.0-240.rt7.54.el8
redhat/kernel<0:4.18.0-240.el8
0:4.18.0-240.el8
Linux Linux kernel<=5.5.2
Debian Debian Linux=8.0
openSUSE Leap=15.1
NetApp Active Iq Unified Manager Vmware Vsphere
NetApp Cloud Backup
NetApp Hci Baseboard Management Controller=h410c
NetApp Solidfire Baseboard Management Controller
Broadcom Brocade Fabric Operating System Firmware
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Google Android
debian/linux
5.10.223-15.10.262-16.1.176-16.1.180-16.12.94-16.12.101-17.1.7-17.1.8-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.31.1.rt56.1169.el7
  2. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1160.31.1.el7
  3. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-957.80.1.el7
  4. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:3.10.0-1062.56.1.el7
  5. Upgrade

    Upgrade redhat/kernel-rt to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.rt7.54.el8
  6. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 0:4.18.0-240.el8
  7. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.262-1Fixed in 6.1.176-1Fixed in 6.1.180-1Fixed in 6.12.94-1Fixed in 6.12.101-1Fixed in 7.1.7-1Fixed in 7.1.8-1

Event History

Jan 30, 2020
CVE Published
12:00 AM
Feb 6, 2020
CVE Published
via MITRE·12:06 AM
Data Sourced
via MITRE·12:06 AM
Description
Data Sourced
via NVD·01:15 AM
DescriptionSeverityWeaknessAffected Software
Feb 13, 2020
Data Sourced
via Red Hat·12:00 PM
DescriptionSeverityAffected Software
Jun 1, 2020
Data Sourced
via Android·12:00 AM
SeverityWeaknessAffected Software
Jan 11, 2024
Data Sourced
via Launchpad·11:53 PM
Description
Aug 12, 2026
Data Sourced
via Debian·04:29 PM
DescriptionAffected Software
Aug 14, 2026
Data Sourced
via Ubuntu·04:30 PM
RemedyDescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2020-8648?

CVE-2020-8648 is classified as a high-severity vulnerability due to its potential to crash the system.

2

How do I fix CVE-2020-8648?

To fix CVE-2020-8648, you should upgrade to the patched kernel versions provided by your distribution.

3

What systems are affected by CVE-2020-8648?

CVE-2020-8648 affects various Linux kernel versions up to 5.5.2 and specific distributions like Red Hat, Ubuntu, and Debian.

4

Can CVE-2020-8648 be exploited remotely?

No, CVE-2020-8648 is considered a local privilege escalation vulnerability, meaning it requires local access to the system.

5

Is there a workaround for CVE-2020-8648 if I cannot update?

There are no specific workarounds recommended for CVE-2020-8648; updating the kernel is the primary solution.

Company

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