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GHSA-4W55-4RVM-3V48

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

Details

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

s390/zcrypt: Close speculative mem read possibility

The domain value is extracted from a given CCA or EP11 ioctl struct when a CPRB is about to be sent. Thus this is a user controlled value. Under some special conditions (custom device node used, administrative load) this value is used as an array index after bounds checking, but without speculation barrier.

Add the missing array_index_nospec() call to prevent speculative execution where this domain value is used.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74466"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T13:17:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Close speculative mem read possibility\n\nThe domain value is extracted from a given CCA or EP11 ioctl struct\nwhen a CPRB is about to be sent. Thus this is a user controlled value.\nUnder some special conditions (custom device node used, administrative\nload) this value is used as an array index after bounds checking, but\nwithout speculation barrier.\n\nAdd the missing array_index_nospec() call to prevent speculative\nexecution where this domain value is used.",
  "id": "GHSA-4w55-4rvm-3v48",
  "modified": "2026-08-15T15:30:33Z",
  "published": "2026-08-15T15:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74466"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82b62eda68abfb7a33ac40f24b8c4128c2891148"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-74466 (GCVE-0-2026-74466)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:19

Title

s390/zcrypt: Close speculative mem read possibility

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Close speculative mem read possibility The domain value is extracted from a given CCA or EP11 ioctl struct when a CPRB is about to be sent. Thus this is a user controlled value. Under some special conditions (custom device node used, administrative load) this value is used as an array index after bounds checking, but without speculation barrier. Add the missing array_index_nospec() call to prevent speculative execution where this domain value is used.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

2 references

URL	Tags
https://git.kernel.org/stable/c/82b62eda68abfb7a3…
https://git.kernel.org/stable/c/e935cd525af4c6ed2…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < 82b62eda68abfb7a33ac40f24b8c4128c2891148 (git) Affected: cfd68b33094e1a92249850ff3c3c92ae9112a541 , < e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82b62eda68abfb7a33ac40f24b8c4128c2891148",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            },
            {
              "lessThan": "e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb",
              "status": "affected",
              "version": "cfd68b33094e1a92249850ff3c3c92ae9112a541",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/s390/crypto/zcrypt_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "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": "7.1.8",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Close speculative mem read possibility\n\nThe domain value is extracted from a given CCA or EP11 ioctl struct\nwhen a CPRB is about to be sent. Thus this is a user controlled value.\nUnder some special conditions (custom device node used, administrative\nload) this value is used as an array index after bounds checking, but\nwithout speculation barrier.\n\nAdd the missing array_index_nospec() call to prevent speculative\nexecution where this domain value is used."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:19:56.359Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/82b62eda68abfb7a33ac40f24b8c4128c2891148"
        },
        {
          "url": "https://git.kernel.org/stable/c/e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb"
        }
      ],
      "title": "s390/zcrypt: Close speculative mem read possibility",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74466",
    "datePublished": "2026-08-15T12:27:05.020Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-17T05:19:56.359Z",
    "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-4W55-4RVM-3V48

CVE-2026-74466 (GCVE-0-2026-74466)

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