{"id":"CVE-2026-43083","title":"net: ioam6: fix OOB and missing lock","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ioam6: fix OOB and missing lock\n\nWhen trace->type.bit6 is set:\n\n    if (trace->type.bit6) {\n        ...\n        queue = skb_get_tx_queue(dev, skb);\n        qdisc =…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < 6d1d9ed9b409e0662241e3d245d574a18f643494","Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < 95a1334748c95dd15546056280ade0c4b8dd7b78","Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < b30b1675aa2bcf0491fd3830b051df4e08a7c8ca","Linux 5.17"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T15:14:26.779582Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:31.904Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43083","references":[{"url":"https://git.kernel.org/stable/c/6d1d9ed9b409e0662241e3d245d574a18f643494"},{"url":"https://git.kernel.org/stable/c/95a1334748c95dd15546056280ade0c4b8dd7b78"},{"url":"https://git.kernel.org/stable/c/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca"}],"tags":["cve.org"],"epss":0.00632,"epssPercentile":0.49221,"ingestedAt":"2026-10-16T17:24:46.681Z","slug":"CVE-2026-43083","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet: ioam6: fix OOB and missing lock\n\nWhen trace->type.bit6 is set:\n\n    if (trace->type.bit6) {\n        ...\n        queue = skb_get_tx_queue(dev, skb);\n        qdisc = rcu_dereference(queue->qdisc);\n\nThis code can lead to an out-of-bounds access of the dev->_tx[] array\nwhen is_input is true. In such a case, the packet is on the RX path and\nskb->queue_mapping contains the RX queue index of the ingress device. If\nthe ingress device has more RX queues than the egress device (dev) has\nTX queues, skb_get_queue_mapping(skb) will exceed dev->num_tx_queues.\nAdd a check to avoid this situation since skb_get_tx_queue() does not\nclamp the index. This issue has also revealed that per queue visibility\ncannot be accurate and will be replaced later as a new feature.\n\nWhile at it, add missing lock around qdisc_qstats_qlen_backlog(). The\nfunction __ioam6_fill_trace_data() is called from both softirq and\nprocess contexts, hence the use of spin_lock_bh() here.\n\n## Affected\n\n- `Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < 6d1d9ed9b409e0662241e3d245d574a18f643494`\n- `Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < 95a1334748c95dd15546056280ade0c4b8dd7b78`\n- `Linux >= b63c5478e9cb1d1504eb02d9dac827ad24612b32 < b30b1675aa2bcf0491fd3830b051df4e08a7c8ca`\n- `Linux 5.17`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}