CVE-2021-3772: Medium severity Linux Linux kernel vulnerability

Published Sep 2, 2021
·
Updated

A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses.

Affected Software

63 affected componentsFixes available
redhat/kernel-rt<0:4.18.0-372.9.1.rt7.166.el8
0:4.18.0-372.9.1.rt7.166.el8
redhat/kernel<0:4.18.0-372.9.1.el8
0:4.18.0-372.9.1.el8
Linux Linux kernel<5.15.0
redhat Enterprise Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Oracle Communications Cloud Native Core Binding Support Function=22.1.3
Oracle Communications Cloud Native Core Network Exposure Function=22.1.1
Oracle Communications Cloud Native Core Policy=22.2.0
NetApp E-Series SANtricity OS Controller=11.0
NetApp E-Series SANtricity OS Controller=11.0.0
NetApp E-Series SANtricity OS Controller=11.20
NetApp E-Series SANtricity OS Controller=11.25
NetApp E-Series SANtricity OS Controller=11.30
NetApp E-Series SANtricity OS Controller=11.30.5r3
NetApp E-Series SANtricity OS Controller=11.40
NetApp E-Series SANtricity OS Controller=11.40.3r2
NetApp E-Series SANtricity OS Controller=11.40.5
NetApp E-Series SANtricity OS Controller=11.50.1
NetApp E-Series SANtricity OS Controller=11.50.2
NetApp E-Series SANtricity OS Controller=11.50.2-p1
NetApp E-Series SANtricity OS Controller=11.60
NetApp E-Series SANtricity OS Controller=11.60.0
NetApp E-Series SANtricity OS Controller=11.60.1
NetApp E-Series SANtricity OS Controller=11.60.3
NetApp E-Series SANtricity OS Controller=11.70.1
NetApp E-Series SANtricity OS Controller=11.70.2
NetApp Solidfire \& Hci Management Node
NetApp Solidfire \& Hci Storage Node
NetApp Hci Compute Node
NetApp H300s Firmware
NetApp H300s
NetApp H500s Firmware
NetApp H500s
NetApp H700s Firmware
NetApp H700s
NetApp H410s Firmware
NetApp H410s
NetApp H410c Firmware
NetApp H410c
NetApp H610c Firmware
NetApp H610c
NetApp H610s Firmware
NetApp H610s
NetApp H615c Firmware
NetApp H615c
All of the following
NetApp H300s Firmware
NetApp H300s
All of the following
NetApp H500s Firmware
NetApp H500s
All of the following
NetApp H700s Firmware
NetApp H700s
All of the following
NetApp H410s Firmware
NetApp H410s
All of the following
NetApp H410c Firmware
NetApp H410c
All of the following
NetApp H610c Firmware
NetApp H610c
All of the following
NetApp H610s Firmware
NetApp H610s
All of the following
NetApp H615c Firmware
NetApp H615c
debian/linux
5.10.223-15.10.251-16.1.159-16.1.164-16.12.73-16.12.74-26.19.6-26.19.8-1

Remediation

Information

As the SCTP module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: if # echo "install sctp /bin/true" >> /etc/modprobe.d/disable-sctp.conf The system will need to be restarted if the SCTP modules are loaded. In most circumstances, the SCTP kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.

Patch Available

https://bugzilla.redhat.com/show_bug.cgi?id=2000694

Patch Available

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=32f8807a48ae55be0e76880cfe8607a18b5bb0df

Patch Available

https://github.com/torvalds/linux/commit/32f8807a48ae55be0e76880cfe8607a18b5bb0df

Patch Available

https://ubuntu.com/security/CVE-2021-3772

Patch Available

https://www.oracle.com/security-alerts/cpujul2022.html

Event History

Sep 2, 2021
Data Sourced
via Red Hat·05:36 PM
DescriptionSeverityAffected Software
Sep 8, 2021
CVE Published
06:38 AM
Mar 2, 2022
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
DescriptionWeakness
Jan 11, 2024
Data Sourced
via Launchpad·11:58 PM
Description
Mar 7, 2026
Data Sourced
via Ubuntu·09:24 PM
RemedyDescriptionSeverityAffected Software
Mar 15, 2026
Data Sourced
via Debian·09:31 PM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2021-3772?

CVE-2021-3772 is classified as a medium severity vulnerability due to its potential to disrupt existing SCTP associations.

2

How do I fix CVE-2021-3772?

To remediate CVE-2021-3772, upgrade to the recommended kernel versions provided by your Linux distribution vendor.

3

Who is affected by CVE-2021-3772?

CVE-2021-3772 affects various Linux kernel versions, specifically those prior to specified patched versions from Red Hat and Debian.

4

What type of attack does CVE-2021-3772 enable?

CVE-2021-3772 allows a blind attacker to potentially terminate existing SCTP associations through the use of malicious packets.

5

Which Linux distributions are impacted by CVE-2021-3772?

CVE-2021-3772 impacts Red Hat Enterprise Linux, Debian, and other distributions using vulnerable Linux kernel versions.

Company

Resources

Contact

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