CVE-2026-99124

Full vulnerability record from the local CVENow database.

Description

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

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-28 11:17:32.077000

Last modified

2026-10-30 13:21:46.630000

View original CVE JSON

{
  "id": "CVE-2026-99124",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-28T11:17:32.077",
  "lastModified": "2026-10-30T13:21:46.630",
  "vulnStatus": "Received",
  "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->length. If\nuser-space provides a short buffer, meaning a larger report->length 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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "arch/s390/pci/pci_sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "ad1be38823d4b6dbc88648da296ca0c0f8824a55",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "61ce6f9a527932f4482ebe00847490f17d63a0d1",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "332f2d867f64dd530517e9a58394e3eab454df12",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "ff31c34e921d11c7da3d7664ce495106267ca408",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "eb10f25e32576bb3dbbea4457648614537f04211",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "ba5001db9bb23ff7d2ea328c405c287ffb07786f",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "126a7c227d8543e13903dd5622640c1f0fcc5a16",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "368704a65be8620df795ccbeb44e025dafbc3e1f",
              "lessThan": "8ac60ae2a307a50b599bf5d300b448d638f3ba29",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "arch/s390/pci/pci_sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "4.7",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "4.7",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.273",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.224",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.161",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.115",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.59",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.13",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/126a7c227d8543e13903dd5622640c1f0fcc5a16",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/332f2d867f64dd530517e9a58394e3eab454df12",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/61ce6f9a527932f4482ebe00847490f17d63a0d1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ad1be38823d4b6dbc88648da296ca0c0f8824a55",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ba5001db9bb23ff7d2ea328c405c287ffb07786f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/eb10f25e32576bb3dbbea4457648614537f04211",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ff31c34e921d11c7da3d7664ce495106267ca408",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}