---
id: CVE-2026-99124
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, bu…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    ad1be38823d4b6dbc88648da296ca0c0f8824a55
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    61ce6f9a527932f4482ebe00847490f17d63a0d1
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    332f2d867f64dd530517e9a58394e3eab454df12
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    ff31c34e921d11c7da3d7664ce495106267ca408
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    eb10f25e32576bb3dbbea4457648614537f04211
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    ba5001db9bb23ff7d2ea328c405c287ffb07786f
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    126a7c227d8543e13903dd5622640c1f0fcc5a16
  - >-
    Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f <
    8ac60ae2a307a50b599bf5d300b448d638f3ba29
  - Linux 4.7
published: '2026-10-28'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:41:58.903Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99124'
references:
  - url: 'https://git.kernel.org/stable/c/ad1be38823d4b6dbc88648da296ca0c0f8824a55'
  - url: 'https://git.kernel.org/stable/c/61ce6f9a527932f4482ebe00847490f17d63a0d1'
  - url: 'https://git.kernel.org/stable/c/332f2d867f64dd530517e9a58394e3eab454df12'
  - url: 'https://git.kernel.org/stable/c/ff31c34e921d11c7da3d7664ce495106267ca408'
  - url: 'https://git.kernel.org/stable/c/eb10f25e32576bb3dbbea4457648614537f04211'
  - url: 'https://git.kernel.org/stable/c/ba5001db9bb23ff7d2ea328c405c287ffb07786f'
  - url: 'https://git.kernel.org/stable/c/126a7c227d8543e13903dd5622640c1f0fcc5a16'
  - url: 'https://git.kernel.org/stable/c/8ac60ae2a307a50b599bf5d300b448d638f3ba29'
tags:
  - cve.org
epss: 0.00177
epssPercentile: 0.07333
ingestedAt: '2026-10-28T11:09:40.438Z'
---

## Overview

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.

## Affected

- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < ad1be38823d4b6dbc88648da296ca0c0f8824a55`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < 61ce6f9a527932f4482ebe00847490f17d63a0d1`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < 332f2d867f64dd530517e9a58394e3eab454df12`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < ff31c34e921d11c7da3d7664ce495106267ca408`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < eb10f25e32576bb3dbbea4457648614537f04211`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < ba5001db9bb23ff7d2ea328c405c287ffb07786f`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < 126a7c227d8543e13903dd5622640c1f0fcc5a16`
- `Linux >= 368704a65be8620df795ccbeb44e025dafbc3e1f < 8ac60ae2a307a50b599bf5d300b448d638f3ba29`
- `Linux 4.7`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.