CVE-2026-43083
CriticalCVSS 9.1Summary
W jądrze systemu Linux zidentyfikowano podatność, która prowadzi do dostępu poza granice tablicy dev->_tx[], gdy trace->type.bit6 jest ustawione, a is_input jest prawdziwe. Problem ten występuje, gdy urządzenie wejściowe ma więcej kolejek RX niż urządzenie wyjściowe TX.
Risk Assessment
Dostęp poza granice tablicy może prowadzić do nieprzewidywalnych zachowań systemu, co stwarza ryzyko awarii lub naruszenia integralności danych. W przypadku wykorzystania tej podatności, atakujący może uzyskać dostęp do pamięci, co może prowadzić do eskalacji uprawnień.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona. Dodatkowo, warto monitorować i weryfikować konfigurację kolejek RX i TX w urządzeniach sieciowych.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net: ioam6: fix OOB and missing lock When trace->type.bit6 is set: if (trace->type.bit6) { ... queue = skb_get_tx_queue(dev, skb); qdisc = rcu_dereference(queue->qdisc); This code can lead to an out-of-bounds access of the dev->_tx[] array when is_input is true. In such a case, the packet is on the RX path and skb->queue_mapping contains the RX queue index of the ingress device. If the ingress device has more RX queues than the egress device (dev) has TX queues, skb_get_queue_mapping(skb) will exceed dev->num_tx_queues. Add a check to avoid this situation since skb_get_tx_queue() does not clamp the index. This issue has also revealed that per queue visibility cannot be accurate and will be replaced later as a new feature. While at it, add missing lock around qdisc_qstats_qlen_backlog(). The function __ioam6_fill_trace_data() is called from both softirq and process contexts, hence the use of spin_lock_bh() here.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS