Vulnerability-Lookup

GHSA-Q3WC-VX42-5J3G

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2026-04-18 09:30

Details

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

net: mctp: Don't access ifa_index when missing

In mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but only when the struct ifaddrmsg is provided. Otherwise it will be comparing to uninitialised memory - reproducible in the syzkaller case from dhcpd, or busybox "ip addr show".

The kernel MCTP implementation has always filtered by ifa_index, so existing userspace programs expecting to dump MCTP addresses must already be passing a valid ifa_index value (either 0 or a real index).

BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38006"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-908"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T10:15:31Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: Don\u0027t access ifa_index when missing\n\nIn mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but\nonly when the struct ifaddrmsg is provided. Otherwise it will be\ncomparing to uninitialised memory - reproducible in the syzkaller case from\ndhcpd, or busybox \"ip addr show\".\n\nThe kernel MCTP implementation has always filtered by ifa_index, so\nexisting userspace programs expecting to dump MCTP addresses must\nalready be passing a valid ifa_index value (either 0 or a real index).\n\nBUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824\n netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309",
  "id": "GHSA-q3wc-vx42-5j3g",
  "modified": "2026-04-18T09:30:16Z",
  "published": "2025-06-18T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38006"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38006 (GCVE-0-2025-38006)

Vulnerability from cvelistv5 – Published: 2025-06-18 09:28 – Updated: 2026-05-11 21:19

Title

net: mctp: Don't access ifa_index when missing

Summary

In the Linux kernel, the following vulnerability has been resolved: net: mctp: Don't access ifa_index when missing In mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but only when the struct ifaddrmsg is provided. Otherwise it will be comparing to uninitialised memory - reproducible in the syzkaller case from dhcpd, or busybox "ip addr show". The kernel MCTP implementation has always filtered by ifa_index, so existing userspace programs expecting to dump MCTP addresses must already be passing a valid ifa_index value (either 0 or a real index). BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/8ef7b3f0db69e2f4a…
https://git.kernel.org/stable/c/acab78ae12c7fefb4…
https://git.kernel.org/stable/c/d4d1561d17eb72908…
https://git.kernel.org/stable/c/24fa213dffa470166…
https://git.kernel.org/stable/c/f11cf946c0a92c560…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < 8ef7b3f0db69e2f4a80be351f6aee9a4c2332ef9 (git) Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < acab78ae12c7fefb4f3bfe22e00770a5faa42724 (git) Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < d4d1561d17eb72908e4489c0900d96e0484fac20 (git) Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < 24fa213dffa470166ec014f979f36c6ff44afb45 (git) Affected: 583be982d93479ea3d85091b0fd0b01201ede87d , < f11cf946c0a92c560a890d68e4775723353599e1 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.6.92 , ≤ 6.6.* (semver) Unaffected: 6.12.30 , ≤ 6.12.* (semver) Unaffected: 6.14.8 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mctp/device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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            {
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              "versionType": "git"
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            },
            {
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          ]
        },
        {
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          "product": "Linux",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
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                  "vulnerable": true
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                },
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: Don\u0027t access ifa_index when missing\n\nIn mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but\nonly when the struct ifaddrmsg is provided. Otherwise it will be\ncomparing to uninitialised memory - reproducible in the syzkaller case from\ndhcpd, or busybox \"ip addr show\".\n\nThe kernel MCTP implementation has always filtered by ifa_index, so\nexisting userspace programs expecting to dump MCTP addresses must\nalready be passing a valid ifa_index value (either 0 or a real index).\n\nBUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824\n netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:19:29.451Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45"
        },
        {
          "url": "https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1"
        }
      ],
      "title": "net: mctp: Don\u0027t access ifa_index when missing",
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38006",
    "datePublished": "2025-06-18T09:28:17.773Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2026-05-11T21:19:29.451Z",
    "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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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