CVE-2026-43083 (GCVE-0-2026-43083)

Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-05-06 07:40
VLAI?
Title
net: ioam6: fix OOB and missing lock
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b63c5478e9cb1d1504eb02d9dac827ad24612b32 , < 6d1d9ed9b409e0662241e3d245d574a18f643494 (git)
Affected: b63c5478e9cb1d1504eb02d9dac827ad24612b32 , < 95a1334748c95dd15546056280ade0c4b8dd7b78 (git)
Affected: b63c5478e9cb1d1504eb02d9dac827ad24612b32 , < b30b1675aa2bcf0491fd3830b051df4e08a7c8ca (git)
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    Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ioam6.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
            }
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "5.17"
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
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                  "versionEndExcluding": "7.0",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-06T07:40:18.504Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "net: ioam6: fix OOB and missing lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43083",
    "datePublished": "2026-05-06T07:40:18.504Z",
    "dateReserved": "2026-05-01T14:12:55.983Z",
    "dateUpdated": "2026-05-06T07:40:18.504Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43083",
      "date": "2026-05-07",
      "epss": "0.00017",
      "percentile": "0.04088"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43083\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T10:16:21.493\",\"lastModified\":\"2026-05-06T13:08:07.970\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6d1d9ed9b409e0662241e3d245d574a18f643494\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95a1334748c95dd15546056280ade0c4b8dd7b78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b30b1675aa2bcf0491fd3830b051df4e08a7c8ca\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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