CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the bridge component, specifically the configuration of the CFM (Connectivity Fault Management) interval, which can lead to a denial of service condition. When an invalid or out-of-range CCM interval is set, it triggers a tight loop that continuously allocates memory until the system runs out of resources. System administrators and developers managing Linux-based networking environments should prioritize this issue to prevent potential service disruptions.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: bridge: cfm: reject invalid CCM interval at configuration time ccm_tx_work_expired() re-arms itself via queue_delayed_work() using the configured exp_interval converted by interval_to_us(). When exp_interval is BR_CFM_CCM_INTERVAL_NONE or out of range, interval_to_us() returns 0, causing the worker to fire immediately in a tight loop that allocates skbs until OOM. Fix this by validating exp_interval at configuration time: - Constrain IFLA_BRIDGE_CFM_CC_CONFIG_EXP_INTERVAL to the valid range [BR_CFM_CCM_INTERVAL_3_3_MS, BR_CFM_CCM_INTERVAL_10_MIN] in the netlink policy so userspace cannot set an invalid value. - Reject starting CCM TX in br_cfm_cc_ccm_tx() when exp_interval has not yet been configured (defaults to 0 from kzalloc).