CVE-2021-3894

A vulnerability was found in the Linux kernel. This flaw allows an unprivileged local user to panic the system, resulting in a denial of service by calling setsockopt(2) with specially crafted arguments. The highest threat from this vulnerability is to system availability.

This flaw was found to be a duplicate of CVE-2022-0322. Please see https://access.redhat.com/security/cve/CVE-2022-0322 for information about affected products and security errata.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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:

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 CIFS 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 the KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.