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

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34
VLAI
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 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < ba5001db9bb23ff7d2ea328c405c287ffb07786f (git)
Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < 126a7c227d8543e13903dd5622640c1f0fcc5a16 (git)
Affected: 368704a65be8620df795ccbeb44e025dafbc3e1f , < 8ac60ae2a307a50b599bf5d300b448d638f3ba29 (git)
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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"
          ],
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              "versionType": "git"
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          "vendor": "Linux",
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              "version": "7.3",
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            }
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      ],
      "cpeApplicability": [
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                },
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                  "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ba5001db9bb23ff7d2ea328c405c287ffb07786f"
        },
        {
          "url": "https://git.kernel.org/stable/c/126a7c227d8543e13903dd5622640c1f0fcc5a16"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29"
        }
      ],
      "title": "s390/pci: Fix leak of uninitialized kernel data in SCLP report",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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",
  "vulnerability-lookup:meta": {
    "nvd": {
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        "affected": [
          {
            "affectedData": [
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                "product": "Linux",
                "programFiles": [
                  "arch/s390/pci/pci_sysfs.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
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                    "versionType": "git"
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                  }
                ]
              }
            ],
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          }
        ],
        "cveTags": [],
        "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."
          }
        ],
        "id": "CVE-2026-99124",
        "lastModified": "2026-10-28T11:17:32.077",
        "metrics": {},
        "published": "2026-10-28T11:17:32.077",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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