CVE-2026-31420
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność, która pozwala na przekazanie wartości interwału równiej zeru do funkcji br_mrp_start_test() i br_mrp_start_in_test(), co prowadzi do pętli, która wyczerpuje pamięć systemową i powoduje panikę jądra. Problem ten dotyczy również funkcji br_mrp_start_in_test_parse() dla ramek testowych interkonektów.
Risk Assessment
W wyniku tej podatności może dojść do całkowitego wyczerpania pamięci systemowej, co prowadzi do awarii systemu i przestoju w działaniu usług. Organizacje powinny być świadome ryzyka związanego z niekontrolowanym wykorzystaniem zasobów systemowych.
Recommendation
Zaleca się zastosowanie NLA_POLICY_MIN(NLA_U32, 1) w tabelach nla_policy dla atrybutów IFLA_BRIDGE_MRP_START_TEST_INTERVAL oraz IFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL, aby odrzucać wartość zerową na etapie analizy atrybutów netlink, zanim dotrze do kodu harmonogramowania workqueue.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bridge: mrp: reject zero test interval to avoid OOM panic br_mrp_start_test() and br_mrp_start_in_test() accept the user-supplied interval value from netlink without validation. When interval is 0, usecs_to_jiffies(0) yields 0, causing the delayed work (br_mrp_test_work_expired / br_mrp_in_test_work_expired) to reschedule itself with zero delay. This creates a tight loop on system_percpu_wq that allocates and transmits MRP test frames at maximum rate, exhausting all system memory and causing a kernel panic via OOM deadlock. The same zero-interval issue applies to br_mrp_start_in_test_parse() for interconnect test frames. Use NLA_POLICY_MIN(NLA_U32, 1) in the nla_policy tables for both IFLA_BRIDGE_MRP_START_TEST_INTERVAL and IFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL, so zero is rejected at the netlink attribute parsing layer before the value ever reaches the workqueue scheduling code. This is consistent with how other bridge subsystems (br_fdb, br_mst) enforce range constraints on netlink attributes.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS