Published: 29 October 2011
The br_parse_ip_options function in net/bridge/br_netfilter.c in the Linux kernel before 2.6.39 does not properly initialize a certain data structure, which allows remote attackers to cause a denial of service by leveraging connectivity to a network interface that uses an Ethernet bridge device.
From the Ubuntu security team
Scot Doyle discovered that the bridge networking interface incorrectly handled certain network packets. A remote attacker could exploit this to crash the system, leading to a denial of service.
CVSS 3 base score: 7.5
Introduced by 462fb2af, 2.6.37
the fix below is actually a simple optimisation and not required: break-fix: 462fb2af9788a82a534f8184abfde31574e1cfa0 10949550bd1e50cc91c0f5085f7080a44b0871fe