Tesla Model S Iris Modem Race Condition Firewall Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass the firewall on the Iris modem in affected Tesla Model S vehicles. Authentication is not required to exploit this vulnerability. The specific flaw exists within the firewall service. The issue results from a failure to obtain the xtables lock. An attacker can leverage this vulnerability to bypass firewall rules. Was ZDI-CAN-23197.
The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.