CVE-2026-43083

Technical Description

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 us

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References