CVE-2021-27365

A flaw was found in the Linux kernel. A heap buffer overflow in the iSCSI subsystem is triggered by setting an iSCSI string attribute to a value larger than one page and then trying to read it. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Mitigation

The LIBISCSI module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions:

# echo "install libiscsi /bin/true" >> /etc/modprobe.d/disable-libiscsi.conf  

The system will need to be restarted if the libiscsi modules are loaded. In most circumstances, the libiscsi kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use.

If the system requires iscsi to work correctly, this mitigation may not be suitable.

If you need further assistance, see KCS article <https://access.redhat.com/solutions/41278&gt; or contact Red Hat Global Support Services.