Firewall bypass via missing xtables lock

Firewall bypass in the Iris modem of Tesla Model S 2023.44.29 allows remote attackers on an adjacent network to bypass firewall rules. The firewall service modifies rules without obtaining the xtables lock, creating a race that permits concurrent operations to evade enforcement. No authentication is required, but exploitation requires network-adjacent access and yields access across firewall rules rather than arbitrary code execution.