Vulnerability-Lookup

GHSA-7C6Q-XH8W-H79R

Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31

Details

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

s390/pci: Fix leak of uninitialized kernel data in SCLP report

While report_error_write() checks that the provided buffer is at least as large as the header struct, but not that it is large enough to contain the report with the length claimed by report->length. If user-space provides a short buffer, meaning a larger report->length than the actually written payload, up to around 4K of kernel data from past the kmalloc(len + 1) sized buffer allocated in kernfs_fop_write_iter() will leak into the SCLP report.

However, as the entity processing the SCLP is privileged and able to access at least the page including the report, this does not leak data that entity could not access but it is still an out of bounds read and a malformed error report that should be rejected.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-99124"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-28T11:17:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pci: Fix leak of uninitialized kernel data in SCLP report\n\nWhile report_error_write() checks that the provided buffer is at least\nas large as the header struct, but not that it is large enough to\ncontain the report with the length claimed by report-\u003elength. If\nuser-space provides a short buffer, meaning a larger report-\u003elength than\nthe actually written payload, up to around 4K of kernel data from past\nthe kmalloc(len + 1) sized buffer allocated in kernfs_fop_write_iter()\nwill leak into the SCLP report.\n\nHowever, as the entity processing the SCLP is privileged and able to\naccess at least the page including the report, this does not leak data\nthat entity could not access but it is still an out of bounds read and\na malformed error report that should be rejected.",
  "id": "GHSA-7c6q-xh8w-h79r",
  "modified": "2026-10-28T12:31:04Z",
  "published": "2026-10-28T12:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99124"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/126a7c227d8543e13903dd5622640c1f0fcc5a16"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba5001db9bb23ff7d2ea328c405c287ffb07786f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-99124 (GCVE-0-2026-99124)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34

Title

s390/pci: Fix leak of uninitialized kernel data in SCLP report

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/pci: Fix leak of uninitialized kernel data in SCLP report While report_error_write() checks that the provided buffer is at least as large as the header struct, but not that it is large enough to contain the report with the length claimed by report->length. If user-space provides a short buffer, meaning a larger report->length than the actually written payload, up to around 4K of kernel data from past the kmalloc(len + 1) sized buffer allocated in kernfs_fop_write_iter() will leak into the SCLP report. However, as the entity processing the SCLP is privileged and able to access at least the page including the report, this does not leak data that entity could not access but it is still an out of bounds read and a malformed error report that should be rejected.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7033 records in the last 180 days details

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ba5001db9bb23ff7d…
https://git.kernel.org/stable/c/126a7c227d8543e13…
https://git.kernel.org/stable/c/8ac60ae2a307a50b5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < ba5001db9bb23ff7d2ea328c405c287ffb07786f (git) Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < 126a7c227d8543e13903dd5622640c1f0fcc5a16 (git) Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < 8ac60ae2a307a50b599bf5d300b448d638f3ba29 (git)
Linux	Linux	Affected: 4.7 Unaffected: 0 , < 4.7 (semver) Unaffected: 6.18.59 , ≤ 6.18.* (semver) Unaffected: 7.2.13 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/pci/pci_sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ba5001db9bb23ff7d2ea328c405c287ffb07786f",
              "status": "affected",
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "versionType": "git"
            },
            {
              "lessThan": "126a7c227d8543e13903dd5622640c1f0fcc5a16",
              "status": "affected",
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "versionType": "git"
            },
            {
              "lessThan": "8ac60ae2a307a50b599bf5d300b448d638f3ba29",
              "status": "affected",
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/pci/pci_sysfs.c"
          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.59",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.13",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pci: Fix leak of uninitialized kernel data in SCLP report\n\nWhile report_error_write() checks that the provided buffer is at least\nas large as the header struct, but not that it is large enough to\ncontain the report with the length claimed by report-\u003elength. If\nuser-space provides a short buffer, meaning a larger report-\u003elength than\nthe actually written payload, up to around 4K of kernel data from past\nthe kmalloc(len + 1) sized buffer allocated in kernfs_fop_write_iter()\nwill leak into the SCLP report.\n\nHowever, as the entity processing the SCLP is privileged and able to\naccess at least the page including the report, this does not leak data\nthat entity could not access but it is still an out of bounds read and\na malformed error report that should be rejected."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-28T10:34:39.370Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29"
        }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99124",
    "datePublished": "2026-10-28T10:34:39.370Z",
    "dateReserved": "2026-09-25T10:25:14.393Z",
    "dateUpdated": "2026-10-28T10:34:39.370Z",
    "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.

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