CVE-2026-99124

Kernel-data disclosure via unchecked SCLP report length

Published Oct 28, 2026 · Updated Oct 28, 2026

Linux s390 PCI reporting allows local users to copy kernel data into SCLP reports via out-of-bounds reads from malformed sysfs writes. In arch/s390/pci/pci_sysfs.c, report_error_write() checks the header size but passes a user-supplied report length exceeding the written payload to sclp_pci_report(). Access requires writing the owner-only report_error attribute, and the privileged SCLP recipient already has access to the affected memory.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux s390 PCI reporting allows local users to copy kernel data into SCLP reports via out-of-bounds reads from malformed sysfs writes. In arch/s390/pci/pci_sysfs.c, report_error_write() checks the header size but passes a user-supplied report length exceeding the written payload to sclp_pci_report(). Access requires writing the owner-only report_error attribute, and the privileged SCLP recipient already has access to the affected memory.

The record

CVE
CVE-2026-99124
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=368704a65be8620df795ccbeb44e025dafbc3e1f <126a7c227d8543e13903dd5622640c1f0fcc5a16
  2. Affected versionversion=368704a65be8620df795ccbeb44e025dafbc3e1f <8ac60ae2a307a50b599bf5d300b448d638f3ba29
  3. Affected versionversion=368704a65be8620df795ccbeb44e025dafbc3e1f <ba5001db9bb23ff7d2ea328c405c287ffb07786f
  4. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=368704a65be8620df795ccbeb44e025dafbc3e1f <126a7c227d8543e13903dd5622640c1f0fcc5a16; version=368704a65be8620df795ccbeb44e025dafbc3e1f <8ac60ae2a307a50b599bf5d300b448d638f3ba29; version=368704a65be8620df795ccbeb44e025dafbc3e1f <ba5001db9bb23ff7d2ea328c405c287ffb07786f; version=4.7

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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