CVE-2020-16119

A flaw was found in the Linux kernel. When reusing a socket with an attached dccps_hc_tx_ccid as a listener, the socket will be used after being released leading to denial of service (DoS) or a potential code execution. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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.

Red Hat has previously automatically blacklisted the DCCP module in Red Hat Enterprise Linux 7.5 and later in /etc/modprobe.d/dccp-blacklist.conf.

If this file does not exist with the above contents, the module can be prevented loading by running the command

echo "install dccp /bin/true" >> /etc/modprobe.d/dccp-blacklist.conf

The system will need to be restarted if the DCCP module is loaded. In most circumstances, the DCCP 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.