{"id":"CVE-2026-43083","summary":"net: ioam6: fix OOB and missing lock","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ioam6: fix OOB and missing lock\n\nWhen trace-\u003etype.bit6 is set:\n\n    if (trace-\u003etype.bit6) {\n        ...\n        queue = skb_get_tx_queue(dev, skb);\n        qdisc = rcu_dereference(queue-\u003eqdisc);\n\nThis code can lead to an out-of-bounds access of the dev-\u003e_tx[] array\nwhen is_input is true. In such a case, the packet is on the RX path and\nskb-\u003equeue_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-\u003enum_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.","modified":"2026-06-03T03:54:38.061101736Z","published":"2026-05-06T07:40:18.504Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43083.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6d1d9ed9b409e0662241e3d245d574a18f643494"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95a1334748c95dd15546056280ade0c4b8dd7b78"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43083.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43083"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"b63c5478e9cb1d1504eb02d9dac827ad24612b32"},{"fixed":"6d1d9ed9b409e0662241e3d245d574a18f643494"},{"fixed":"95a1334748c95dd15546056280ade0c4b8dd7b78"},{"fixed":"b30b1675aa2bcf0491fd3830b051df4e08a7c8ca"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43083.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"6.18.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.14"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43083.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}