4.1.1.4 Ensure audit_backlog_limit is sufficient

Information

The backlog limit has a default setting of 64

Rationale:

during boot if audit=1, then the backlog will hold 64 records. If more that 64 records are created during boot, auditd records will be lost and potential malicious activity could go undetected.

Solution

Edit /etc/default/grub and add audit_backlog_limit=<BACKLOG SIZE> to GRUB_CMDLINE_LINUX:
Example:

GRUB_CMDLINE_LINUX='audit_backlog_limit=8192'

Run the following command to update the grub2 configuration:

# update-grub

See Also

https://workbench.cisecurity.org/files/3219