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CVE-2026-31420 is a denial-of-service vulnerability in the Linux kernel bridge Media Redundancy Protocol (MRP) subsystem. The affected code paths, including br_mrp_start_test(), br_mrp_start_in_test(), and the related br_mrp_start_in_test_parse() path for interconnect test frames, accept a user-supplied interval value from netlink without validating that it is non-zero. If an attacker supplies an interval of 0, usecs_to_jiffies(0) evaluates to 0, causing the delayed work handlers br_mrp_test_work_expired and br_mrp_in_test_work_expired to continuously reschedule themselves with zero delay. This creates a tight loop on system_percpu_wq that allocates and transmits MRP test frames at maximum rate until system memory is exhausted, ultimately triggering a kernel panic via OOM deadlock. The fix adds minimum-value validation at the netlink attribute parsing layer using NLA_POLICY_MIN(NLA_U32, 1) for IFLA_BRIDGE_MRP_START_TEST_INTERVAL and IFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL.
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