Vulnerability-Lookup

GHSA-GC56-W4QV-MCC4

Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-19 18:32

Details

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

s390/qeth: Check CAP_NET_ADMIN for private ioctls

Gate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL, SIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN capable check to ensure unprivileged users cannot invoke them.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74467"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: Check CAP_NET_ADMIN for private ioctls\n\nGate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL,\nSIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN\ncapable check to ensure unprivileged users cannot invoke them.",
  "id": "GHSA-gc56-w4qv-mcc4",
  "modified": "2026-08-19T18:32:28Z",
  "published": "2026-08-15T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74467"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ea5210db058347481c93849786982f874f7be2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e48168825818bf4a13c743582227d15f1d30d04"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8fb69547924bbb3d7c900a0d7d137a7234db3f5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93a0a846ec59a88e0c402878a15357a5ce430eb4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b40c74262f7e1e601221cebccdbdb2b392ff9976"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd63c7879eaa87f1958f7ee027813356fcd9ff11"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d211028bac1bd0fff0026bfa2a8328e5b78cd0e6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74467 (GCVE-0-2026-74467)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

Title

s390/qeth: Check CAP_NET_ADMIN for private ioctls

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/qeth: Check CAP_NET_ADMIN for private ioctls Gate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL, SIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN capable check to ensure unprivileged users cannot invoke them.

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

7 references

URL	Tags
https://git.kernel.org/stable/c/8fb69547924bbb3d7…
https://git.kernel.org/stable/c/3ea5210db05834748…
https://git.kernel.org/stable/c/4e48168825818bf4a…
https://git.kernel.org/stable/c/b40c74262f7e1e601…
https://git.kernel.org/stable/c/bd63c7879eaa87f19…
https://git.kernel.org/stable/c/93a0a846ec59a88e0…
https://git.kernel.org/stable/c/d211028bac1bd0fff…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 18787eeebd7129ecf4960876d24f349682207783 , < 8fb69547924bbb3d7c900a0d7d137a7234db3f5f (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < 3ea5210db058347481c93849786982f874f7be2d (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < 4e48168825818bf4a13c743582227d15f1d30d04 (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < b40c74262f7e1e601221cebccdbdb2b392ff9976 (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < bd63c7879eaa87f1958f7ee027813356fcd9ff11 (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < 93a0a846ec59a88e0c402878a15357a5ce430eb4 (git) Affected: 18787eeebd7129ecf4960876d24f349682207783 , < d211028bac1bd0fff0026bfa2a8328e5b78cd0e6 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/net/qeth_core_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8fb69547924bbb3d7c900a0d7d137a7234db3f5f",
              "status": "affected",
              "version": "18787eeebd7129ecf4960876d24f349682207783",
              "versionType": "git"
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            {
              "lessThan": "3ea5210db058347481c93849786982f874f7be2d",
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              "version": "18787eeebd7129ecf4960876d24f349682207783",
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              "version": "18787eeebd7129ecf4960876d24f349682207783",
              "versionType": "git"
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              "version": "18787eeebd7129ecf4960876d24f349682207783",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.15",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/qeth: Check CAP_NET_ADMIN for private ioctls\n\nGate the SIOCDEVPRIVATE ioctl commands SIOC_QETH_ADP_SET_SNMP_CONTROL,\nSIOC_QETH_GET_CARD_TYPE and SIOC_QETH_QUERY_OAT with CAP_NET_ADMIN\ncapable check to ensure unprivileged users cannot invoke them."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires a local ioctl(2) on a qeth network interface via socket(SIOCDEVPRIVATE+5..+7); the path is sock_ioctl() -\u003e dev_ioctl() -\u003e dev_siocdevprivate() -\u003e qeth_siocdevprivate() with no remote packet or network protocol entry point.\nAC:L - Any local user who can open an AF_INET socket and name a qeth netdev can invoke these ioctls deterministically; no races, special memory layout, or rare kernel configuration is required beyond s390 hardware with qeth present.\nPR:L - The bug is missing CAP_NET_ADMIN in qeth_siocdevprivate(); generic SIOCDEVPRIVATE handling in dev_ioctl() performs no capability check, so any unprivileged local account on an IBM Z/LinuxONE LPAR can reach these handlers without root or namespace-granted admin rights.\nUI:N - Exploitation needs only the attacker opening a socket and issuing ioctl against a qeth interface; no victim login, mount, or other interactive action is required on a shared mainframe guest.\nS:U - Impact stays within kernel/driver control of the local OSA/QDIO adapter and does not cross a VM, container, or IOMMU security boundary; this is standard local privilege and hardware-management misuse, not a guest-to-host escape.\nC:H - SIOC_QETH_QUERY_OAT and SIOC_QETH_ADP_SET_SNMP_CONTROL copy OSA Express firmware response buffers (link attributes, adapter operational data, SNMP MIB objects, card-type details) to unprivileged userspace, disclosing network hardware management information normally restricted to administrators.\nI:H - SIOC_QETH_ADP_SET_SNMP_CONTROL accepts attacker-controlled qeth_snmp_cmd request/data and forwards IPA_SETADP_SET_SNMP_CONTROL commands to OSA firmware, letting unprivileged users alter adapter SNMP/management state on production IBM Z network interfaces.\nA:H - Handlers honor attacker-chosen buffer sizes (kzalloc(udata_len) in qeth_snmp_command and vzalloc(buffer_len) in qeth_query_oat_command without upper bounds), enabling repeated large allocations for kernel memory exhaustion/OOM, and malformed IPA commands can disrupt adapter operation."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:10.278Z",
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        {
          "url": "https://git.kernel.org/stable/c/93a0a846ec59a88e0c402878a15357a5ce430eb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d211028bac1bd0fff0026bfa2a8328e5b78cd0e6"
        }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74467",
    "datePublished": "2026-08-15T12:27:05.635Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-19T16:37:10.278Z",
    "state": "PUBLISHED"
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  "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.

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GHSA-GC56-W4QV-MCC4

CVE-2026-74467 (GCVE-0-2026-74467)

Tags

Sightings

Nomenclature