Vulnerability-Lookup

GHSA-WC27-X2J9-P8CQ

Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net: mctp: i3c: serialize probe with bus removal

mctp_i3c_probe() drops busdevs_lock after finding the matching bus. A concurrent I3C_NOTIFY_BUS_REMOVE can then unregister and free the bus netdev before probe passes its private data to mctp_i3c_add_device(). The latter consequently adds a list node through a freed mbus pointer.

Keep busdevs_lock held until the device has been added. This also satisfies the __must_hold annotation on mctp_i3c_add_device().

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98018"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-25T11:17:30Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: i3c: serialize probe with bus removal\n\nmctp_i3c_probe() drops busdevs_lock after finding the matching bus. A\nconcurrent I3C_NOTIFY_BUS_REMOVE can then unregister and free the bus\nnetdev before probe passes its private data to mctp_i3c_add_device().\nThe latter consequently adds a list node through a freed mbus pointer.\n\nKeep busdevs_lock held until the device has been added. This also\nsatisfies the __must_hold annotation on mctp_i3c_add_device().",
  "id": "GHSA-wc27-x2j9-p8cq",
  "modified": "2026-09-25T12:31:33Z",
  "published": "2026-09-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98018"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b4707a149a55e8fa75c9ef32b359d60f470a566"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/765c5e357e67916a7aac8ead4ac2fa7d2bffe000"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/906d8dbafabfa81a30e3ade420cb9912f223a5e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6541b2747682fdb2c6ded4a7cf7c39c4067a35c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98018 (GCVE-0-2026-98018)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-09-25 10:23

Title

net: mctp: i3c: serialize probe with bus removal

Summary

In the Linux kernel, the following vulnerability has been resolved: net: mctp: i3c: serialize probe with bus removal mctp_i3c_probe() drops busdevs_lock after finding the matching bus. A concurrent I3C_NOTIFY_BUS_REMOVE can then unregister and free the bus netdev before probe passes its private data to mctp_i3c_add_device(). The latter consequently adds a list node through a freed mbus pointer. Keep busdevs_lock held until the device has been added. This also satisfies the __must_hold annotation on mctp_i3c_add_device().

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/e6541b2747682fdb2…
https://git.kernel.org/stable/c/765c5e357e67916a7…
https://git.kernel.org/stable/c/906d8dbafabfa81a3…
https://git.kernel.org/stable/c/2b4707a149a55e8fa…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 , < e6541b2747682fdb2c6ded4a7cf7c39c4067a35c (git) Affected: c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 , < 765c5e357e67916a7aac8ead4ac2fa7d2bffe000 (git) Affected: c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 , < 906d8dbafabfa81a30e3ade420cb9912f223a5e1 (git) Affected: c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 , < 2b4707a149a55e8fa75c9ef32b359d60f470a566 (git)
Linux	Linux	Affected: 6.7 Unaffected: 0 , < 6.7 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-i3c.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e6541b2747682fdb2c6ded4a7cf7c39c4067a35c",
              "status": "affected",
              "version": "c8755b29b58ec65be17bcb8c40763d2dcb1f1db5",
              "versionType": "git"
            },
            {
              "lessThan": "765c5e357e67916a7aac8ead4ac2fa7d2bffe000",
              "status": "affected",
              "version": "c8755b29b58ec65be17bcb8c40763d2dcb1f1db5",
              "versionType": "git"
            },
            {
              "lessThan": "906d8dbafabfa81a30e3ade420cb9912f223a5e1",
              "status": "affected",
              "version": "c8755b29b58ec65be17bcb8c40763d2dcb1f1db5",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "c8755b29b58ec65be17bcb8c40763d2dcb1f1db5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/mctp/mctp-i3c.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.7",
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                },
                {
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                },
                {
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: i3c: serialize probe with bus removal\n\nmctp_i3c_probe() drops busdevs_lock after finding the matching bus. A\nconcurrent I3C_NOTIFY_BUS_REMOVE can then unregister and free the bus\nnetdev before probe passes its private data to mctp_i3c_add_device().\nThe latter consequently adds a list node through a freed mbus pointer.\n\nKeep busdevs_lock held until the device has been added. This also\nsatisfies the __must_hold annotation on mctp_i3c_add_device()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T10:23:39.706Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/906d8dbafabfa81a30e3ade420cb9912f223a5e1"
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        {
          "url": "https://git.kernel.org/stable/c/2b4707a149a55e8fa75c9ef32b359d60f470a566"
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      "title": "net: mctp: i3c: serialize probe with bus removal",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98018",
    "datePublished": "2026-09-25T10:23:39.706Z",
    "dateReserved": "2026-09-25T10:19:56.069Z",
    "dateUpdated": "2026-09-25T10:23:39.706Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-WC27-X2J9-P8CQ

CVE-2026-98018 (GCVE-0-2026-98018)

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